Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9851fad01cadb5e…

MALICIOUS

PDF

42.0 KB Created: 2020-07-09 18:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: 549e2e99e43b43584ce0e5acd9cf8553 SHA-1: 3714f22259e8be2478dc7f50f7e326a4150adabc SHA-256: d9851fad01cadb5ee23342878d10c47a5a2c4fb0046680ab1f98fd01c8353d38
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The PDF contains a deceptive document body masquerading as a 'Bowflex hvt workout manual' and embeds numerous links. One critical heuristic identified a malicious redirector link, and another flagged a large number of external PDF links, suggesting a link farm. The primary malicious URL is https://ttraff.cc/wb?keyword=bowflex%20hvt%20workout%20manual, which likely leads to further malicious content or phishing pages.

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.cc/wb?keyword=bowflex%20hvt%20workout%20manual In PDF document text
    • http://files.adultlearningarch.com/uploads/1/3/1/3/131380138/02a00372e7.pdfIn PDF document text
    • http://files.ajeplanners.com/uploads/1/3/1/4/131406816/sifojopese_nidukuzinagimo_xutokajofuzi_roxurugar.pdfIn PDF document text
    • http://files.anamarielewis.com/uploads/1/3/0/7/130738755/2951266.pdfIn PDF document text
    • http://files.wildcatbands.org/uploads/1/3/1/8/131858287/45459ffdb04551.pdfIn PDF document text
    • http://files.peequality.com/uploads/1/3/0/7/130740090/rumaxo_buwibis_bepelu.pdfIn PDF document text
    • http://files.capecodhomelearners.com/uploads/1/3/1/6/131606864/139846.pdfIn PDF document text
    • http://files.bsapack1hk.org/uploads/1/3/2/7/132741555/5180853.pdfIn PDF document text
    • http://files.carolinastormhedgehogs.com/uploads/1/3/1/6/131637291/fanipewonosewagafuv.pdfIn PDF document text
    • http://files.mcgannonfitness.com/uploads/1/3/2/6/132696080/sajilu_gapiruxe_vulosafe_xizoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dafowamu.files.wordpress.com/2020/06/41377131919.pdfIn PDF document text
    • https://susawakixer.files.wordpress.com/2020/07/64841155304.pdfIn PDF document text
    • https://zapirad.files.wordpress.com/2020/07/fufute.pdfIn PDF document text
    • https://zitexop.files.wordpress.com/2020/06/milujus.pdfIn PDF document text
    • https://sisakapajaw.files.wordpress.com/2020/06/jusilejevotowotasekeri.pdfIn PDF document text
    • https://fimovare.files.wordpress.com/2020/07/dakoboginulijizato.pdfIn PDF document text
    • https://wotidabupef.files.wordpress.com/2020/07/xezowodudep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/niborenegukudokeregus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45235944591.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/4274895189.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xizijifopaxefiz.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_off00006680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6680 4996 bytes
SHA-256: ab1122680f6c90f6a5c1cfe84b8586c86fa4149db2b103223907bf5a42f00c93
font_01_sfnt_off0000776f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x776F 10480 bytes
SHA-256: 72e364849da734abd89814ba8dabb0893fe59f0740db518fccf9fa6f3de551cb