Malicious PDF — malware analysis report

Static analysis result for SHA-256 1561fb6c7f864d94…

MALICIOUS

PDF

39.3 KB Created: 2020-10-17 09:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e0549d4681a6c5b4fe51b3aeb0c5f8e3 SHA-1: 57a350f9777bf942fbcc6d9534eab1a436407d2b SHA-256: 1561fb6c7f864d94dbcdd1456e833127ff49bd03f4211a1fb3ff8975dfd422aa
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, disguised with keywords related to job descriptions. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate that this document is part of a link farm designed to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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/123?keyword=payroll+administrator+job+description+pdf In PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/2697538.pdfIn PDF document text
    • https://wedebiki.weebly.com/uploads/1/3/0/9/130969436/gamadepina_fegomuxit.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/filosom-lusiwikafese-jerupuxorukoti-novubolifunuw.pdfIn PDF document text
    • https://xivenisulebitok.weebly.com/uploads/1/3/1/3/131378814/vasefanesi.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/wozumadaku-mukevewurovebu-nefebo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5f881a929467a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365649/normal_5f870a5f3cbf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368958/normal_5f8a778b77fab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368500/normal_5f8a43931f217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365549/normal_5f86f493d1ecb.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/791ffcef-ccae-4636-96d8-00df39104e36/kilije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db63480b-cc95-46ea-9d02-bd904b6869d0/48335493774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ad7b9e3-19c8-4933-8c24-46d7174d91ed/tetomuzot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2393/9753/files/wovojavatidopawolikute.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0567/3111/files/vasomeb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8614/1847/files/nevafidusojukabin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/7224/5926/files/mufit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6645/8266/files/total_gym_elite_exercise_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1905/7822/files/86409022947.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8697/7441/files/worediduwizizo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2738/9851/files/chi_full_episode.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3674/0250/files/jozasirolabijipikunoves.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8868/2915/files/gerurifizazobomakebapevop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2715/9448/files/2877115077.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_off00005baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BAA 5620 bytes
SHA-256: 05d40e35daac41bb1e4f2e02c16c16b959a7e39459c9f8e8cb9d0c58d181e7c9
font_01_sfnt_off00006eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB2 9620 bytes
SHA-256: b3fd586d1e86af8c1213a3aa37666d3267bf6d8082ee4c7dadc8ba572b721c47

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