Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a5bd8aa15ced5b…

MALICIOUS

PDF

37.3 KB Created: 2020-08-05 03:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ef88510fae1410ac7d1a1e755eed8934 SHA-1: 295ec41800a8128cbc3b1cec3d2e557ab05b4860 SHA-256: 21a5bd8aa15ced5b2dc9659463d9deb4b9365b476598484703e2617fa0ce5254
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to a redirector service designed to host SEO-optimized content. The primary redirector URL is associated with malicious activity, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, contains text related to sheet music and the redirector URL, reinforcing the lure.

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=westworld+black+hole+sun+sheet+music+pdf In PDF document text
    • http://files.wlcbands.com/uploads/1/3/1/1/131163931/2921846.pdfIn PDF document text
    • http://files.tomsimonsonphotography.com/uploads/1/3/2/6/132683330/zomeresuloxali_pewuponewelozo.pdfIn PDF document text
    • http://files.theflourishsisterhood.com/uploads/1/3/1/3/131398156/95d18288fa830.pdfIn PDF document text
    • http://files.msdanielledobeleit.com/uploads/1/3/1/4/131454065/sosem.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/1/0440/4399/3238/files/lenofovu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8477/5577/files/popanobetebova.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5805/9671/files/btw_meaning_in_texting.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5014/7733/files/37815610404.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5665/9621/files/kuzebofupaji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/64847513074.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4555/2277/files/youtube_e4_b8_8b_e8_bd_bd.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2303/1720/files/83221764710.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9284/4448/files/67801789621.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6730/9206/files/sofakupatepabo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7997453156.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9744/6816/files/38658251479.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_off000050d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50D7 5704 bytes
SHA-256: 2d3b0dcee3339fb159c6e0614de7a8c8d9d9576bfb736b836a738e452e9d1fb3
font_01_sfnt_off0000642e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x642E 10436 bytes
SHA-256: 57266a48a2bf71bf92db9e4ab2c6d1e7834e5b6b6482ceed6bb5fd07d60b799f

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