Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2cd1105099f6c6e…

MALICIOUS

PDF

41.9 KB Created: 2020-07-09 14:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 76389408f48b2739d688ab2ba9317685 SHA-1: e954fd4c97700cc69732762436997e071b3d4bd7 SHA-256: f2cd1105099f6c6e8618cd8b62b402d585e2663c377e75131aab13f5ca5413c9
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One prominent link redirects to 'ttraff.com', a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'textbook on rheumatic diseases pdf' and mentions the wkhtmltopdf generator, suggesting a lure to disguise malicious redirection as a document download. The primary attack pattern involves tricking the user into clicking a malicious link disguised as a resource download.

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=textbook%20on%20rheumatic%20diseases%20pdf In PDF document text
    • http://files.businessbcs.com/uploads/1/3/2/7/132740343/e9c81eaa854.pdfIn PDF document text
    • http://files.fusaroconsulting.com/uploads/1/3/1/6/131637695/626c0bf616cdb78.pdfIn PDF document text
    • http://files.outcomemedia.com.au/uploads/1/3/0/7/130738845/folufa_xuxatuketodij.pdfIn PDF document text
    • http://files.mafhaus.com/uploads/1/3/1/3/131380251/31c1e35ef43547.pdfIn PDF document text
    • http://files.refineaestheticsllc.com/uploads/1/3/1/4/131438642/xewef-pufivugabud.pdfIn PDF document text
    • http://files.williamsburgrec.com/uploads/1/3/2/6/132682745/tagogumolizim_fofuzipupi.pdfIn PDF document text
    • http://files.nalinikrishnankutty.com/uploads/1/3/0/8/130874128/mewajuluxojuvafox.pdfIn PDF document text
    • http://files.kproductionservices.com/uploads/1/3/2/7/132740498/304e2dbdb.pdfIn PDF document text
    • http://files.orsolyaivanyi.com/uploads/1/3/1/0/131070527/4853482.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://lininolo.files.wordpress.com/2020/06/sajenajuxajoredus.pdfIn PDF document text
    • https://potataz.files.wordpress.com/2020/07/duminerukojaxodaliwuvij.pdfIn PDF document text
    • https://tasifad313954747.files.wordpress.com/2020/06/tinixafejudumes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/57308776079.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29426312843.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37357510366.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kofuka.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_off00006431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6431 5464 bytes
SHA-256: d8e1c144c097d69492289bc99e191ee1434082b96a103e86c4df10b8468cde88
font_01_sfnt_off00007690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7690 10164 bytes
SHA-256: 1362f2af8b554bf5f0ca55fca70d194724d018528e2cbba2eb43cca136fc74e8

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