Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20582fd396785fc…

MALICIOUS

PDF

41.5 KB Created: 2020-08-08 21:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8085805a0e3f0dcd0b1850c77091c36b SHA-1: 8ff06eb3cd94f61e0add897d32c1663a7781ae9d SHA-256: c20582fd396785fc55b85e3a9356aec4ae8a47d31ff2cd5fa99c5af07730a6fc
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'math worksheets pdf 3rd grade' and a URL that appears to be a lure. The primary malicious URL identified is ttraff.ru, which is used in conjunction with a keyword that suggests an attempt to disguise malicious activity as educational content. The presence of a large number of external PDF links further supports a link farm or SEO poisoning tactic.

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=math+worksheets+pdf+3rd+grade In PDF document text
    • http://files.hollowsquarepress.com/uploads/1/3/0/7/130775998/zixisudotowamol-wameripetat-kemasopomese.pdfIn PDF document text
    • http://files.rikkiducornet.com/uploads/1/3/1/0/131069824/c402b3c067.pdfIn PDF document text
    • http://files.navdeepgill.com/uploads/1/3/1/4/131483249/kijanodev-rukufaki-fulefemuzote-fokagu.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/1/0436/9930/6648/files/fenox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/9998/5822/files/ethical_issues_in_functional_areas_of_business.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65069223210.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3426/4231/files/weginemod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8814/9668/files/lomapovujulirebi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4691/1643/files/43127569047.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/5466/5621/files/bayesian_classifier.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4613/2119/files/tabubobilopakewodudadup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0908/9447/files/bonap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8617/6675/files/sotebejajeb.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_off0000626d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x626D 5596 bytes
SHA-256: 52ef774f03aef3e61461dcb543f45de741ab8ecb7da1088b67d5a5c44733efb7
font_01_sfnt_off00007590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7590 10384 bytes
SHA-256: 1e03b11065788db3a492598c3611bd6cabbbf8b813dd263d07554a937563d5e5

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