Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed906408a398b2b…

MALICIOUS

PDF

39.3 KB Created: 2020-08-24 02:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 71700c30fa24ca613ad65e920a0075f8 SHA-1: d978f9c586843ce8a0b0047c1b56c2dc90b9dfca SHA-256: 4ed906408a398b2b4168a089ba65c016716744e8462e4d17e4361c7fa828c756
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=medical+virology+mcqs+with+answers'. This indicates a phishing or social engineering attempt to redirect the user to a malicious site. The document body, though heavily obfuscated, contains this same URL, reinforcing the malicious intent. The presence of a PDF link farm heuristic further suggests this document is part of a larger effort to distribute malicious links.

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=medical+virology+mcqs+with+answers In PDF document text
    • http://fejufija.nysmathregentsprep.com/uploads/1/3/1/4/131482975/zobibe_fezerek.pdfIn PDF document text
    • http://files.fwdskillzone.com/uploads/1/3/1/4/131453907/48ba82f20513.pdfIn PDF document text
    • http://files.firstpeoplesfirst.org/uploads/1/3/1/4/131437873/9157595.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/1/0430/4669/9165/files/69829794761.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8759/2608/files/plant_and_animal_cell_lab_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1392/2206/files/filenugivox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0595/9588/files/tecnicas_de_aprendizaje_activo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4081/5774/files/21140088761.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1387/3569/files/catalyst_athletics_standard_warm_up.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7602/4475/files/9756036246.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7754/2823/files/11392306224.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1799/3366/files/79504363080.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 3

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_off00005b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B16 5736 bytes
SHA-256: 7f57fffbeac32a5cd203254fa9aa29a29ff1030cb38666f0287876d72697f339
font_01_sfnt_off00006e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8A 10012 bytes
SHA-256: 4c448727133d5bac493688310d38236ef86e4a9c52308f503db6e0ba79457689

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