Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4da9693cfa99cb…

MALICIOUS

PDF

40.6 KB Created: 2020-08-06 11:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: cf5c2566252db8b3ace9c08fe0fcba7e SHA-1: 90cd33ca3b03b62b92580f1797aaa99ba8fe35fc SHA-256: ea4da9693cfa99cb2bcd214154cee65f2a25fc49202d8c00c97f62b49036da78
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links, including one that redirects to known malicious infrastructure, disguised as a free download. The document body and heuristics indicate a lure for a "Brain on fire pdf free download", which is likely a phishing or scam attempt. The presence of numerous external PDF links suggests an attempt to create a link farm or distribute further malicious content.

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.cc/pify?keyword=brain+on+fire+pdf+free+download In PDF document text
    • http://files.saraandreahoffman.com/uploads/1/3/2/8/132814219/5357b82c4.pdfIn PDF document text
    • http://files.manaskalar.com/uploads/1/3/1/4/131406140/3788150.pdfIn PDF document text
    • http://tiwida.countrychic.shop/uploads/1/3/1/3/131384284/sawafadedologazovun.pdfIn PDF document text
    • http://files.pabigfootcampingadventure.com/uploads/1/3/2/7/132740329/3365822.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/1/0433/6071/4904/files/90984032347.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0716/5095/files/entrepreneurship_and_intrapreneurship.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/7400/0798/files/83024124926.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2925/8649/files/pikima.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7545/2569/files/loxozomumeluj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8787/9587/files/nerotozokuwuga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4245/5197/files/18606767214.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/psychosocial_development_theory.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4386/3198/files/46395621652.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9387/6118/files/zufogob.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 2

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_off000061c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61C6 4996 bytes
SHA-256: 909e53f8dc87a74432215b8c2114ea133d5e858d5a08b13117e03b75c11cdcb1
font_01_sfnt_off000072e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72E9 10140 bytes
SHA-256: a858959bd31a02b9a8117408348e7ab5bf90eb4e4b97f0a170f1c4ece1fe860f

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