Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad40fb3bfce93c3…

MALICIOUS

PDF

41.4 KB Created: 2020-08-17 05:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f3020036af2d89f4440fb706465ca438 SHA-1: 41b7d8ec1a6214dbdf2250df3065453f4fef259a SHA-256: cad40fb3bfce93c3bf9e05a23d6b047cc367b66eb1fb060b08659f592650d347
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links that redirect to a known malicious redirector, ttraff.cc, which is likely part of a link farm designed for SEO manipulation. The document body, though partially corrupted, contains the phrase 'Free vpn for android in china' and the malicious URL, suggesting a lure to entice users to click on the malicious links. The ML classifier also 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/pify?keyword=free+vpn+for+android+in+china In PDF document text
    • http://bupob.keyconceptslearning.com/uploads/1/3/1/3/131383483/8441574.pdfIn PDF document text
    • http://files.stmartindp.com/uploads/1/3/0/7/130738991/7229639.pdfIn PDF document text
    • http://niwowiri.flipflopfantasy.ca/uploads/1/3/1/4/131453329/b70c8453fed8bd.pdfIn PDF document text
    • http://bonobaf.viktorcage.shop/uploads/1/3/2/7/132740541/nivasazudato.pdfIn PDF document text
    • http://megapa.tcfrcn.org/uploads/1/3/1/3/131379945/be7f5c9581665e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8352/1445/files/amelie_vals_piano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9236/9823/files/xipegewevevafuve.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/tupagojerof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/0784/8096/files/applications_of_machine_learning_in_cyber_security.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/3099/2280/files/the_ultimate_javascript_manual_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2685/6610/files/milovigabumalifezixetom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8276/6743/files/komis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0316/6369/files/chicken_farming_business_plan.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 2

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_off0000644e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x644E 5048 bytes
SHA-256: 0a670397e17f625c5b9bcd373d0aad0fab4dd23704f81d6988f51d511b05de72
font_01_sfnt_off0000757f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x757F 10292 bytes
SHA-256: 587d7ef58b91f027ec8761cb4413a64f90c6aecdd2e1209bc2bb8510a52cc83f

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