Malicious PDF — malware analysis report

Static analysis result for SHA-256 c022ef74b2b8122e…

MALICIOUS

PDF

38.9 KB Created: 2020-08-25 10:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3c937fcd9ea6e8bc5cd510d6ef890950 SHA-1: 96362bae80a56b657727fb0fe5f035b02244310f SHA-256: c022ef74b2b8122e636e0e7faf0b599ec30f352665c8b4c1ad1434ab707a6a20
194 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to ttraff.ru. The document body, though heavily obfuscated, contains the same URL and text suggesting it's a lure for 'pte academic reading practice test pdf'. The presence of a link farm heuristic further indicates a malicious intent to distribute links. No scripts were extracted from this sample.

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.ru/pify?keyword=pte+academic+reading+practice+test+pdf In PDF document text
    • http://files.laurenmonteiro.com/uploads/1/3/2/6/132695306/dulatu-wofiz-jukufedolowela-pexowoka.pdfIn PDF document text
    • http://files.crossfithermitage.com/uploads/1/3/2/3/132303170/jubasafalukigojupo.pdfIn PDF document text
    • http://files.lorimerconsulting.co.uk/uploads/1/3/1/1/131164452/gupazoti-mamikepopo-letolebisilod.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/1/0431/5168/7848/files/see_chegg_answers_free_2019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/1834/8712/files/nubuximiwoji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6926/8373/files/zawutotusaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3489/3718/files/yamunashtak_in_gujarati.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8896/0933/files/fetuvazazapuge.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5662/5829/files/74037866530.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6570/3590/files/6857133099.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0311/6709/files/40381457163.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3945/7429/files/harley_davidson_parts_manual_free.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 4

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_off00005b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B50 5444 bytes
SHA-256: 7c3954a6dc7e1b1a4ed72476fd4f3d547d7f89427aaa33c0082ea249c5688193
font_01_sfnt_off00006db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB6 9708 bytes
SHA-256: d113a4dbe14a308f827e970082268a1c21b40979e8554f71cbb3cd1ed9e82b92

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