Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b39b600c6043433…

MALICIOUS

PDF

39.8 KB Created: 2020-07-30 17:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 0d531303e26e2bbe4378ccc18929872b SHA-1: 9b7d0f515aa93a5b3a1ce2ef73fc67ac1116aeed SHA-256: 5b39b600c6043433b382734fa4502d6aebaa04f7b8b17bfcb0240756c0b84fa8
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to a redirector service (ttraff.cc) that is known to host malicious content. The document body, though heavily obfuscated, appears to be a lure for free PDF downloads, aligning with phishing and SEO link farm tactics. The ML classifier strongly indicated maliciousness, and the presence of redirector links suggests an attempt to distribute further malicious payloads.

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=aula+internacional+1+nueva+edicion+libro+del+profesor+pdf+gratis In PDF document text
    • http://files.snohomishvalleyicerink.com/uploads/1/3/1/4/131454090/1893275.pdfIn PDF document text
    • http://files.tomitago.com/uploads/1/3/1/3/131398091/82a07153.pdfIn PDF document text
    • http://files.bayorchestra.com/uploads/1/3/1/0/131070212/wibakajezijo-jidovezeg.pdfIn PDF document text
    • http://files.lisamaki.blog/uploads/1/3/0/7/130776518/955749.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/1/0430/7917/2257/files/81212779175.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/temavisivomikabasibo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1574/8253/files/nakepawuvisawavopozarupux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2178/6521/files/wavajodo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2808/5912/files/kifuropoduwib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7187/1912/files/74951974101.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6495/8879/files/lupudifogovugudigejaper.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xomuburisuxenogiduta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1560/2337/files/5606956265.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3431/1845/files/91799205644.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 7

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_off00005a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A9F 5444 bytes
SHA-256: 450700abc4121ac9d908c293b99a6ad9f76932fde37eb90147711069211541e4
font_01_sfnt_off00006d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D33 10440 bytes
SHA-256: 5e154ed37a38ade4d58e7e6362b6818f931ececfcbaae967e35bb0b82b11cc0c

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