Malicious PDF — malware analysis report

Static analysis result for SHA-256 3603f6c799c1a27f…

MALICIOUS

PDF

40.8 KB Created: 2020-10-30 14:54:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: cc4f9b1137d051e174fc881dc3c695eb SHA-1: b6b1135ac09ac6f16c65405cf6f6cd84cf9a94bb SHA-256: 3603f6c799c1a27fa928d270a39b2b78ebf76caabde87c8fa787978b41ea77ad
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search results or distribute further malicious content. The presence of a malicious redirector URL further supports the malicious nature of the document.

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/aws?keyword=asm+fm+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4423148/normal_5f9c01fbb3467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421329/normal_5f9a1cb989681.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404122/normal_5f9a7b0c8c786.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413702/normal_5f94dce5a212e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424330/normal_5f9afa5a50db2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376103/normal_5f8ab77fe11d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368979/normal_5f8979f19f7d8.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/numegubowalonan/collins_grammar_for_ielts_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/altura_fondo_uterino.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0865/4492/files/craigslist_south_florida_jobs_west_palm_beach.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/9185/2957/files/xuwazulumunulo.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/70922140285.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/sotikera.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/pivelogupabowuvo.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/bernard_arnault_biography.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/denotation_and_connotation_in_semantics.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_off0000545b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x545B 4332 bytes
SHA-256: 65fb4c583440a764f944ad2d1e42bc2700b7035661b0bba590b3090ac9bb41dc
font_01_sfnt_off000062da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62DA 11068 bytes
SHA-256: 8a12d2e3af7ea3506494c41782c95e4c0f1c29a79918a6dfc155bae95eee84ec
font_02_sfnt_off00008870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8870 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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