Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c4e24181132b56…

MALICIOUS

PDF

46.5 KB Created: 2020-10-12 16:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: b4fb850d5be4a2b2c5ac0bee98c60abb SHA-1: 9a7c4fd1abb1e54e37d994113fc4a1da1894956a SHA-256: a8c4e24181132b56cd862d0077d1246e5eb0beadb204daeb17c0d3f60bd0946a
184 Risk Score

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://cctraff.ru/strik?keyword=angry+birds+classic+game+apk+download In PDF document text
    • http://files.the-stress-site.net/uploads/1/3/1/4/131407324/3106031.pdfIn PDF document text
    • http://kabifare.richardhore.com/uploads/1/3/0/7/130740497/xoromezawabap.pdfIn PDF document text
    • http://files.katiemanthey.com/uploads/1/3/0/7/130776688/wupizojenikofane.pdfIn PDF document text
    • http://files.unikcatz.com/uploads/1/3/0/9/130969599/nufitiwileposolipa.pdfIn PDF document text
    • http://palikam.premoderndiplomats.org/uploads/1/3/0/7/130739893/b7514abc3164e8a.pdfIn PDF document text
    • https://site-1041770.mozfiles.com/files/1041770/kopikusasip.pdfIn PDF document text
    • https://site-1036745.mozfiles.com/files/1036745/pawutuxigilolofowonewipub.pdfIn PDF document text
    • https://site-1038777.mozfiles.com/files/1038777/gezek.pdfIn PDF document text
    • https://site-1040427.mozfiles.com/files/1040427/kiselifapisofozitef.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/8f7f21de-4768-4c6a-baef-f7b160fce05b/6236729218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c54752e7-db17-420b-aba6-07df2d732595/97644505028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e0b5e6e-a5a3-4932-9d35-71e291c8a8d7/47218638898.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/898b04d9-788f-40ee-96d3-bc82ad40b9cd/50144749484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5445337b-3b74-4af8-9c88-6c907efb2a57/jisoravadupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bfadc20-061c-4b79-a5f8-9be9b8c3015b/komoroduj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c072ff2d-7db7-44fe-af2d-8145c9abb877/37701208507.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84ed95d6-7971-4ffc-bbc3-cfdfde708c6f/tejik.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6804 5488 bytes
SHA-256: eaf2add7030a6eadeec3d2fc35eedc1b14e292a1235ab17ac1a83ef1aa2a86d9
font_01_sfnt_off00007a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A91 10480 bytes
SHA-256: 69db15cd6b6a79e73def94feae5a3b060d5b00a1f7fb8910fb12301e6874d8e8
font_02_sfnt_off00009e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E3A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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