Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d87dfa57996f6ad…

MALICIOUS

PDF

47.2 KB Created: 2020-07-08 22:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: 2b29262c196fbd6dfd0965a02ee60533 SHA-1: 83834abe1325bafb3640bc25eb244b9caff5a3f5 SHA-256: 8d87dfa57996f6adb44f9d483d133f654965f76f87b0a840024843b6a85c658d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, with a primary link directing to a known malicious redirector. The document body and embedded links suggest a SEO-based lure, attempting to trick users into visiting malicious sites by disguising them as relevant search results. The ML classifier strongly indicated maliciousness.

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://ttraff.com/wb?keyword=causes%20of%20primary%20amenorrhea%20pdf In PDF document text
    • http://files.professorwillis.com/uploads/1/3/0/9/130969819/3536095.pdfIn PDF document text
    • http://files.seedrinkeat.com/uploads/1/3/2/6/132681204/jalosozapatobe.pdfIn PDF document text
    • http://files.harrowcinevideo.org.uk/uploads/1/3/1/1/131163740/8564070.pdfIn PDF document text
    • http://files.shearserenitysalon.com/uploads/1/3/1/3/131383553/53b9878d6b0f11.pdfIn PDF document text
    • http://files.patagoniaorchardsllc.com/uploads/1/3/1/3/131398367/3df9500.pdfIn PDF document text
    • http://files.nyccovidrelief.com/uploads/1/3/0/9/130969046/0f1968.pdfIn PDF document text
    • http://files.nalinikrishnankutty.com/uploads/1/3/0/8/130874128/mewajuluxojuvafox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://texufugibat.files.wordpress.com/2020/06/68524892846.pdfIn PDF document text
    • https://jakazikosab.files.wordpress.com/2020/06/65914371618.pdfIn PDF document text
    • https://vosafeviba.files.wordpress.com/2020/06/13505985743.pdfIn PDF document text
    • https://vajowobago.files.wordpress.com/2020/06/85086868811.pdfIn PDF document text
    • https://zetigerut.files.wordpress.com/2020/06/loxivatobuluvuxax.pdfIn PDF document text
    • https://rekaxetif.files.wordpress.com/2020/06/16615950095.pdfIn PDF document text
    • https://zivurun.files.wordpress.com/2020/06/lubumelutebagibe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasodidupafulad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowelikuzamutaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72593533024.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7937 5176 bytes
SHA-256: 4c6af96938274e0f79c62e2daaabfac75e16ed9b200c0b009c97e4e81b0eeca5
font_01_sfnt_off00008aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA5 11436 bytes
SHA-256: b990fa12e3b2b7ea26a6c405e3b19bc3f0a667285713ddb4b1c3f26db3341728

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