Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4fca97f4641ab24…

MALICIOUS

PDF

42.8 KB Created: 2020-08-10 04:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 289e8243b5f2cbb82e56f989573eb294 SHA-1: b0f25cd34525ad2186b0eac326c243c2b2e55ab9 SHA-256: b4fca97f4641ab2405e662e9d97aaa86858999edcb8f4e3854e7f7fc414eecd3
194 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the redirector heuristic. This suggests the primary intent is to redirect the user to malicious infrastructure, likely for further exploitation or credential harvesting. The presence of a large number of external PDF links also indicates a link farm, a common tactic for SEO poisoning or distributing 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.ru/pify?keyword=set+off+and+carry+forward+losses+pdf In PDF document text
    • http://files.davidhellard.com/uploads/1/3/1/3/131380175/felakolo.pdfIn PDF document text
    • http://files.kentuckymoversandmakers.com/uploads/1/3/1/6/131606951/2531926.pdfIn PDF document text
    • http://files.soleaustralia.com/uploads/1/3/1/4/131483830/voloverovuz.pdfIn PDF document text
    • http://files.healthyshmealthy.com/uploads/1/3/1/6/131607053/9250466.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/1/0431/5509/5712/files/11640340185.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0822/8508/files/can_i_find_my_old_myspace.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8683/0998/files/32130658896.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8523/3304/files/vusajamo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/bartenders_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0805/6740/files/vefudikamosu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/notadenagefajofakiwu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5555/3432/files/fudexabavipejexopizegufiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7341/3032/files/46251525601.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9657/8979/files/13891937477.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/gebewujilazozarisugi.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_off00006a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A37 5448 bytes
SHA-256: 938204eb86968d99c4a73ea96962c0aafdd773a206bc64ea03aa7d2ff9eaff0f
font_01_sfnt_off00007ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE8 9728 bytes
SHA-256: a1d6e08591de2990e16389391e73b09d6c74446599d17550b63da61ac43fe941

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