Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c33c371d4265113…

MALICIOUS

PDF

42.0 KB Created: 2020-08-12 09:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 428cad44de5cc52dbef3cd9038b9ac0e SHA-1: 4f01c712597860882c28e8f73bfc2e1db2c6e630 SHA-256: 1c33c371d4265113d5e2b6276df63b3eb505ac15a0c961379c44b92ed6acbe23
194 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting it is related to 'General knowledge mcqs for css pdf'. The primary malicious IOC is the redirector URL, which is designed to lure users into clicking through to potentially harmful content. The file also contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic to increase visibility.

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/wb?keyword=general%20knowledge%20mcqs%20for%20css%20pdf In PDF document text
    • http://safuv.woodenpensdownunder.com/uploads/1/3/0/7/130775451/gudaje.pdfIn PDF document text
    • http://files.platonicadventures.com/uploads/1/3/0/8/130874655/laxolo_mobiridixeb_raroperas.pdfIn PDF document text
    • http://zekebifus.terrieiner.com/uploads/1/3/0/9/130969761/sipufimosejulodago.pdfIn PDF document text
    • http://files.pgmsptsa.org/uploads/1/3/0/8/130814749/dobesiwug.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/1/0437/6782/4533/files/supoxeresabipuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4885/2894/files/dragalia_summon_simulator.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7276/6631/files/tsotsi_athol_fugard.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5129/4628/files/98405908496.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/igcse_biology_revision_notes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0910/6335/files/18045570805.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3420/5590/files/ridereligo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1570/8573/files/65038609590.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9906/2421/files/8524715539.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_off000060aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60AA 5788 bytes
SHA-256: 761696bcaf165a95a7042fa9e43a20b0d578f9106bccd225681babc5f41ae3c9
font_01_sfnt_off00007466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7466 11452 bytes
SHA-256: 5621063a116244c9ed796ea5ec14035532e4eb6eb9a40f2e6ed768c1d7499d64

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