Malicious PDF — malware analysis report

Static analysis result for SHA-256 a884ddb3fa9f6b5b…

MALICIOUS

PDF

44.5 KB Created: 2020-10-27 08:57:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4853bcaf72ceb10f6ba453d902561726 SHA-1: 393667db5f6ca5e0bfe0a52d17af1f33efb31f3e SHA-256: a884ddb3fa9f6b5b8541d987146e6b89f77db9d6e6883870f2b038bc2d1179b7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a significant number of embedded external links, with one identified as a malicious redirector. The presence of a large link farm suggests an attempt to manipulate search engine results or direct users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ggtraff.ru/strik?keyword=does+salt+kill+fleas+on+hardwood+floors In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393190/normal_5f9487427c2a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_5f8b56af4db06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419192/normal_5f962b71d2442.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378165/normal_5f8c4d52a5b4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368224/normal_5f89af332f7c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389127/normal_5f96526034c73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376105/normal_5f89e993dcffd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376375/normal_5f8d39a10e1ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368468/normal_5f8a439de8d76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369149/normal_5f8b0a612e91f.pdfIn PDF document text
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/lizaw_vuwilanidi_desimezomi.pdfIn PDF document text
    • https://dokodajibebabek.weebly.com/uploads/1/3/2/3/132302773/narapopoxelix-wamisemovibila-romaxozusulexi-wuxiwamum.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/1052771.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bojafazes/aspen_hysys_v8_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/70674212066.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/catholic_university_of_malawi_application_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/integrative_behavioral_couples_therapy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71719fcf-89b8-4765-8525-80939f36a92b/21240036228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be6a0c8a-8171-4597-9705-8bdfa380cc4b/rovumominagaxujegedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/068dc412-ce30-40bc-a763-ff2edb2008c7/66704352025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b947e8b2-6eef-42f4-aab6-c89597ba1a94/popivaraxenaxuvajejaluju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96d89349-0d23-4dd3-8e12-cccc151674fd/gesopazaje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8766/8409/files/crohns_disease_guidelines_nice.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6407/2613/files/saregalavixedibas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0600/8216/files/craigslist_mpls_mn_cars.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3897/3345/files/vinyasa_krama_sequence.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6253 4936 bytes
SHA-256: 24d6930762b237cb732c22b5240bda8b034fdadd42c67510444f661c10466304
font_01_sfnt_off0000731a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x731A 10220 bytes
SHA-256: c42f82fc03ae10bef8ec80ed6bd48894de41970017660ce8cb65599e6466cb24
font_02_sfnt_off000095c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95C6 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e