Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6cad70c1cd2925e…

MALICIOUS

PDF

47.8 KB Created: 2020-08-11 22:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 13e4334e8a650c0fc733f86aa1f2849c SHA-1: bbd19e6fadd0d0d804bb981bacd8637c589e328f SHA-256: a6cad70c1cd2925ea7e911323fa66368c3bf53d173e03c3b1d3a3dbf20c82e13
194 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a translation service, which is likely a lure. The ML classifier also strongly indicated maliciousness. The primary IOC is the malicious redirector URL, which is used to deliver the next stage of the attack.

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.com/pify?keyword=d%25E1%25BB%258Bch+ti%25E1%25BA%25BFng+anh+sang+ti%25E1%25BA%25BFng+vi%25E1%25BB%2587t+t%25E1%25BB%25AB+file+pdf In PDF document text
    • http://kufevur.truncale.net/uploads/1/3/0/8/130874064/2759669.pdfIn PDF document text
    • http://files.noeltanderson.com/uploads/1/3/2/6/132681150/8a9d7cac69.pdfIn PDF document text
    • http://files.evansalumni.net/uploads/1/3/1/8/131872104/tebivofobizi_xodasab_nojolap.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/1/0433/2702/9400/files/75969588723.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1434/9219/files/sapply_in_r.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dadimutixiwukigojubiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3075/8054/files/82011342250.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0737/7567/files/tatojotejudevevoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3251/8549/files/14158912168.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2915/8295/files/tulex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4537/0518/files/pajadozosubugasarikakob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9726/0192/files/vatuxitodox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4395/4594/files/33040454981.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3056/9382/files/disat.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 5

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_off00005821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5821 5940 bytes
SHA-256: bea4ebc862dbc3fdb7da6f117e13aba76b088fc320fa51da327aa7c83a23638e
font_01_sfnt_off00006bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB8 21624 bytes
SHA-256: ae549832141ae990fbb380401f2f2994be5131b77da9f96a8dbb7a4e2693d80f
font_02_sfnt_off00009a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A33 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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