Malicious PDF — malware analysis report

Static analysis result for SHA-256 340a786cb43c6535…

MALICIOUS

PDF

57.3 KB Created: 2020-10-25 18:41:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d4381d39d6512f2466c1df0aedb321fd SHA-1: 1e0ff8dd4a31e46e4dc709aa559b48b7767546e3 SHA-256: 340a786cb43c65356a438d34a49190ca3e54ff3b523c26b8a59e2a7d12b9165b
224 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that point to redirector infrastructure and a link farm hosted on disposable domains, indicating a malicious intent to distribute further malicious content or phishing pages. The document body, though heavily obfuscated, contains a URL that matches the suspicious redirector link, reinforcing the lure. The presence of numerous PDF links and the 'SEO Link Farm' heuristic suggest an attempt to artificially inflate search rankings or distribute malware through a large number of seemingly innocuous PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.link/123?keyword=manual+service+samsung+galaxy+s4+mini In PDF document text
    • https://rizenorugeworo.weebly.com/uploads/1/3/4/3/134379336/xifevixekiv.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/3809296.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/paxuvudonarisa-kewaviludoseja-mowolifofubem-noxuv.pdfIn PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/fubazewi.pdfIn PDF document text
    • https://zelapagetuwuj.weebly.com/uploads/1/3/1/4/131406140/kamedod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5f8928f26794c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369784/normal_5f8d530f1ed74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f93a6c9258e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379359/normal_5f8bcff66d60e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388178/normal_5f9527dd67182.pdfIn PDF document text
    • https://xawuwotogot.weebly.com/uploads/1/3/2/6/132695388/1397650.pdfIn PDF document text
    • https://jepupuwupojuv.weebly.com/uploads/1/3/4/4/134481076/memazotowakugop.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/siduru-wojexej-filuko.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/jefakokararemoxukizu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfd2e320-ed5b-4f47-a2b6-4e7bf479f454/dajamotedukufen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ea3f1d1-ddc4-4c5d-8350-db045b9082ba/nutofesamiwunosexorinepe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2cd19d9-a6ba-4c2b-999a-ae4a3d55e5dc/258730318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/102b33c7-9f71-4994-a1eb-54d5e19b3850/48964693304.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9732abe8-6f01-4baf-8746-c7071064b0e0/nofabaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9549/9968/files/duzonadope.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7837/8165/files/whirlpool_super_capacity_465_error_code_f5e1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3062/3894/files/libogodupuxilawil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9249/5521/files/gifted_hands_script.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3272/2599/files/mettler_toledo_sevenexcellence_ph_conductivity_meter_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3556/0606/files/reproductor_de_video_apk_descargar_gratis.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E64 5440 bytes
SHA-256: 03e20824aba5da2ae74d2fc7608f38c2c6f42565975fc35d011af4d212e09829
font_01_sfnt_off0000b0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EC 11292 bytes
SHA-256: cbb0f94ef8a55658641a4091a47d31a92a48fdfbace4f6e14e25ac47427739f6

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