Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5efdf4b9cef89f…

MALICIOUS

PDF

42.8 KB Created: 2020-10-17 19:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 4a23a3d2d042e6aa64dfff24f8027d11 SHA-1: 966c2a921a592f5846518a1d470ef0aaa19786eb SHA-256: fa5efdf4b9cef89f0db94b8c70b1662491dc103c30ba163c7647a479837ef235
184 Risk Score

Malware Insights

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

The PDF file contains numerous links, including one that redirects to a known malicious domain. The document body, though heavily obfuscated, contains text related to downloading an Android ROM, suggesting a lure for potentially unwanted software or malware. The presence of a link farm and redirection to a malicious URL indicates an attempt to drive traffic to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://gettraff.ru/123?keyword=download+rom+android+4.4+kitkat+tablet In PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/mutog.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/jakol.pdfIn PDF document text
    • https://kelobutino.weebly.com/uploads/1/3/0/9/130969458/2161657.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/kotawuzo.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/8536469.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/selagu-wugixinoxule.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/238272f207.pdfIn PDF document text
    • https://ditiwudo.weebly.com/uploads/1/3/1/4/131452947/beturasilaji.pdfIn PDF document text
    • https://xizirogubo.weebly.com/uploads/1/3/0/7/130776043/tapuduzimevofodavi.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/8e6b0c47-c36d-4a31-a0f9-c1aefeccc8bb/buwezamobosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47fb1c3c-030d-4721-988d-a7c3d27ea5e9/22814237770.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f43641fb-8af9-4867-93d8-37901d11f1ff/40267994046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3a44a56-d51a-4466-b62c-d491b2b679df/rurelejogizove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aba5fc0-5200-40cb-a9ef-9b33e1e52e0a/taxesetodikunofegigujeda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0d3f5f9-bd55-4c27-ac3b-7b3dc568bcd7/65117570999.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6879/6311/files/satafugelojizujatofufe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0462/4021/files/51005693120.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/0852/5989/files/defimeliwo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4563/2665/files/bikuruwuxapezafigezu.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_off000069f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69F1 5208 bytes
SHA-256: f89e96af26464c0684bd694b2ce0eb19aaeacf0263a5c888c7ae9ece7b3f11e3
font_01_sfnt_off00007bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BAD 10100 bytes
SHA-256: 9ed2ea5592a209629ae0b263618d96800f3382d7db1a50dabaf2fb388d692950

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