Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb1502a3e49f605…

MALICIOUS

PDF

44.2 KB Created: 2020-08-20 20:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: daf29578f22d23c90aed629d1b188bc3 SHA-1: 43fd38753ead4b7818679fe99e935e2596eaac71 SHA-256: ddb1502a3e49f6050495dfed763a3c6b08b8c5136d679d5dcee25a12f45e4ba2
194 Risk Score

Malware Insights

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

The PDF file contains embedded links, with one pointing to a known malicious redirector. The document body, though partially corrupted, includes text related to 'Topics for group discussion with answers' and the malicious URL, suggesting a lure. The presence of numerous external PDF links further indicates a link farm strategy, likely to obscure the ultimate destination or to improve search engine ranking for malicious content. The ML classifier strongly flagged this PDF as malicious.

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=topics+for+group+discussion+with+answers In PDF document text
    • http://vokanox.talltechteacher.com/uploads/1/3/2/3/132303382/vojobofok-juxobegoromut-gazol-gevepakilaloro.pdfIn PDF document text
    • http://gerakuj.scarboroughmaineyoga.com/uploads/1/3/1/3/131380999/dizufun_mutigum_nipifuva.pdfIn PDF document text
    • http://files.rockvillehelp.org/uploads/1/3/1/4/131437443/5649129.pdfIn PDF document text
    • http://rexovix.cjbrassica.com/uploads/1/3/0/8/130874075/a35c7ca3844db.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/1/0440/3717/7494/files/buwavinu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1189/7504/files/zavamusexukixu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7763/9075/files/second_conditional_exercises_multiple_choice.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7568/1947/files/adagio_baermann.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4031/8375/files/augusto_cury_livros.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pejuzesuloroxutebed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8266/8437/files/87378343670.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7301/1863/files/85499613945.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 6

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_off00006e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E9A 5428 bytes
SHA-256: d87f1d345274e8e178aaa108bf5b77349d273e1efeffc919fcb14fc0d81485f6
font_01_sfnt_off00008113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8113 10200 bytes
SHA-256: c3ac06a62af7a3828113e366d1332f47a8cf81d8ec17b66a56f753338d218e13

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