Malicious PDF — malware analysis report

Static analysis result for SHA-256 261d898e31e9bd82…

MALICIOUS

PDF

35.8 KB Created: 2020-08-20 05:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 62852e684571726cd66a099e52362468 SHA-1: f30b20de658f17bf32af9597a9147a16e1a9a4e5 SHA-256: 261d898e31e9bd824cad44d73877fe2d13fa4017ae6a798cf043a24c80061e63
194 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be the same as the malicious redirector. This suggests the document's primary purpose is to trick users into visiting a malicious website by presenting it as an educational resource.

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.com/pify?keyword=negative+numbers+worksheet+ks2 In PDF document text
    • http://vunoxub.jasdjorep.org/uploads/1/3/0/7/130738854/2964606.pdfIn PDF document text
    • http://wegesi.sharpeningonsite.com/uploads/1/3/0/7/130776334/senodufezo_revalu.pdfIn PDF document text
    • http://files.wichcream.com/uploads/1/3/2/6/132683330/7104014.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/1/0437/5012/9813/files/nulejaje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8765/0211/files/rslogix_download_with_serial_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7038/2490/files/nalupofomud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6499/1649/files/american_english_punctuation_rules.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/94814536522.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0982/6213/files/99696710752.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4627/9080/files/install_tmux_mac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1507/7022/files/khachaturian_sabre_dance.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2868/3674/files/bandook_chalegi_video.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3015/0296/files/27634765034.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 8

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_off00004e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E81 5524 bytes
SHA-256: 309726260edb1fae9ccf627e5f7e666a7b0bbb3d323d2f632d321500ad4c6508
font_01_sfnt_off0000613c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x613C 9784 bytes
SHA-256: 90ff25569bdbc26367ef8953b50fcd52c50506d76305f12e7cb8490f3463fd82

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