Malicious PDF — malware analysis report

Static analysis result for SHA-256 08febcb7351ae569…

MALICIOUS

PDF

45.9 KB Created: 2020-10-23 17:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-28
MD5: fa163d079162aa095097583ff97d3660 SHA-1: 590c018f863f2d6236e128ec5440e4a789bf7a93 SHA-256: 08febcb7351ae56920a34f72d04f0613bfc13cdc95428d4740d053a9522cad83
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches one of the embedded links, suggesting a lure to external content. The presence of a large number of external links, many of which are PDFs, indicates a link farm or SEO manipulation tactic to distribute malicious content.

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://ttraff.com/pify?keyword=nevera+samsung+twin+cooling+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387589/normal_5f8f6ad0ac22b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389394/normal_5f8e463c89438.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_5f8ce2c820a46.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/nukunuraki.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://uploads.strikinglycdn.com/files/0f8ce0bb-0be8-4eba-9222-b497811cbd5e/3296903783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e61a301-2377-47d0-a32e-d58e71a60b21/crsi_reinforcement_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/377ebd9c-634a-4752-a5f1-9b15115fe17e/movetetixenoxas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01f084cc-0a28-49b0-9b67-794bd04d1f96/28514804764.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/457379d0-1254-4671-ace2-efac2005b35d/71053147530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69e7518a-7829-4c90-8ef8-2af8d04bef88/kaitlyn_big_brother_20.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ac7148b-1c68-4d75-90af-aba5e725eeba/9913820977.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/3473/9356/files/bunudozalobiwudetujoru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3309/1496/files/20164411438.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/4246/2618/files/call_of_duty_mobile_android_x86.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/2844/7900/files/23515340104.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/nekevexulevefaragonuje.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/microsoft_access_2016_tutorial_for_beginners.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_off000063e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E5 5124 bytes
SHA-256: f2e09147191a9087d362073fff1206daf1133bda632c6576ba0e6406c211f828
font_01_sfnt_off0000754f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x754F 10808 bytes
SHA-256: 64344bb5cccb529a2cb71c100f1c18f134261fa563cd087f728f0cd8b259c115
font_02_sfnt_off00009a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A71 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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