Malicious PDF — malware analysis report

Static analysis result for SHA-256 06310c96a6466a06…

MALICIOUS

PDF

43.0 KB Created: 2020-09-29 18:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 870a41ba2332692c63030c1aa3d6dfdb SHA-1: 646ffd051752b4196ffec363f13360f96c1eb7e3 SHA-256: 06310c96a6466a06913979dce2f65b0f5b1fa15ca24ca4a01ce6d04c2bcb5e3c
194 Risk Score

Malware Insights

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

The PDF document contains numerous links designed to create an SEO link farm, luring victims to download further content. It redirects to malicious infrastructure, specifically identified as a redirector at 'https://cctraff.ru/strik?keyword=common+barriers+to+learning+pdf', which likely serves as a gateway to malicious payloads. The ML classifier strongly indicated maliciousness, supporting the observed link farm and redirector behavior.

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://cctraff.ru/strik?keyword=common+barriers+to+learning+pdf In PDF document text
    • http://files.dglanded.com/uploads/1/3/0/7/130738758/5105642.pdfIn PDF document text
    • http://nilopafu.helpinghandshandymanllc.com/uploads/1/3/0/8/130873759/jifiri_fasirujadizopa.pdfIn PDF document text
    • http://files.suisekirocks.com/uploads/1/3/1/3/131381772/zulowabidatazovuw.pdfIn PDF document text
    • http://files.applebeechurch.com/uploads/1/3/1/1/131163712/6230672.pdfIn PDF document text
    • http://files.teachinglearningalliance.org/uploads/1/3/2/7/132740327/5820470.pdfIn PDF document text
    • http://bunir.lynncoop.com/uploads/1/3/0/7/130775540/joxejokoko.pdfIn PDF document text
    • http://files.trilolab.net/uploads/1/3/1/3/131383657/866560.pdfIn PDF document text
    • http://titev.researchingthewest.com/uploads/1/3/0/8/130814873/4769bd4a12.pdfIn PDF document text
    • http://rugirev.flopinions.net/uploads/1/3/2/8/132814940/kigojetozav-juwuzatupojugi-furizusixanasek.pdfIn PDF document text
    • http://sijodif.baileysea.com/uploads/1/3/0/7/130740444/kugujekobigazar.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/1/0431/5938/8320/files/16102078610.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5056/3734/files/xutojem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6809/9234/files/73039288079.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0821/9547/files/cubiertas_autoportantes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/3006/8630/files/8720903989.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 6

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_off00006ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ADA 5404 bytes
SHA-256: 515904b3f0314c1d37525710eac4d8479c9eecf6e99536bc4f4d82afa8e11075
font_01_sfnt_off00007d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D14 9996 bytes
SHA-256: 192ed7a0b14cc7ff38b8fb98adf151ad8fe241a8eb5acb951e53f30cfa81b6df

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