Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8ca3bf0bf8caa1…

MALICIOUS

PDF

136.4 KB Created: 2020-07-27 16:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d6842806093eb2342ae7e9140bd1a89c SHA-1: 37d384e72af62b585bea0c1480137d379003ac4d SHA-256: 2c8ca3bf0bf8caa12d363ee439aa1af9fbeddcebf81ef1bbc3b0f44cf0b5583b
194 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic identifying it as a link farm. One of the primary links directs to a known malicious redirector service, 'ttraff.ru', which is likely used to obscure the ultimate malicious destination. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.ru/pify?keyword=borland+c+3.+1+pdf In PDF document text
    • http://files.hannahfairchild.com/uploads/1/3/0/8/130814056/zunowefinubin-barenojajuve-fibetopiwegobu-tokibiwi.pdfIn PDF document text
    • http://files.lennoxweb.com/uploads/1/3/2/6/132696030/291007.pdfIn PDF document text
    • http://files.testsiteforhsct.info/uploads/1/3/2/8/132816096/169d3fede62b4.pdfIn PDF document text
    • http://files.uccstj.com/uploads/1/3/1/4/131407067/780f265538135a.pdfIn PDF document text
    • http://files.collincountyhistorymuseum.org/uploads/1/3/0/9/130969967/sadibugobuveki.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/1/0430/8362/8697/files/zipobonusisejiba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2981/5705/files/40413183444.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2421/9293/files/pejaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/24225842645.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2291/6520/files/jipolapokawenatapo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8052/4710/files/gosomevomodazubinarefajiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/xobagisirurozorume.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0151/2090/files/97706931878.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0979/4463/files/nakosiva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9153/2699/files/74941060860.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ab6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB6F 4808 bytes
SHA-256: aa4f57a046aa611f5ff8ceb929f4c1b4f20ced8a06415aa462f08c15d6a2008a
font_01_sfnt_off0001bbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBC9 28092 bytes
SHA-256: 24caae11ac720d7e69c94a27363924602e577ab93d4e7409af7f5d887833c192
font_02_sfnt_off0001feb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FEB3 16088 bytes
SHA-256: b2ddecaff7e2361bf51021b35f9c014659943b600c4f466cb4656cea9e83b80e

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