Malicious PDF — malware analysis report

Static analysis result for SHA-256 a643c2e39278fdb9…

MALICIOUS

PDF

43.8 KB Created: 2020-07-30 04:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 76e462af7c4dec7c7192e5fe0bdbf396 SHA-1: b3cc492e1124c17aac4838e9e630bb48cd4318bd SHA-256: a643c2e39278fdb97cced9e943223f18364fa8dc44811e065c59047e27281600
194 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of a large number of external links, indicating a link farm designed to redirect users. One of the primary links points to a known malicious redirector. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, which aligns with the link farm heuristic.

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=blank+page+pdf+print In PDF document text
    • http://files.stmoritzlodge.com/uploads/1/3/1/4/131482892/2d6914538.pdfIn PDF document text
    • http://files.uniontemplefwb.org/uploads/1/3/2/6/132695663/rowon.pdfIn PDF document text
    • http://files.wasatchhighcounseling.com/uploads/1/3/0/7/130738889/tivopugo.pdfIn PDF document text
    • http://files.mcbrideinternship.org/uploads/1/3/1/3/131383720/saginovupaji-dovavopojudamuw-zarokubeti-nojawafokedexi.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/1/0432/8331/6891/files/suriwexetakogazavabe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21086069096.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9866/1279/files/40868264839.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0869/5200/files/muxawumusuvijubinanami.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30347825404.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5654/6467/files/defaromij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9072/2454/files/lizeroge.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6535/2095/files/23914191745.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3215/8116/files/voxezux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2892/9945/files/32290714048.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7729/6543/files/mefesupomuliwatojiz.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_off00007067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7067 4820 bytes
SHA-256: 7cda3ffdc1bbe70c1fcd68c950b6fe2cd52eba258913dd11fb05dbbfe5f5d5c4
font_01_sfnt_off000080d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80D8 9660 bytes
SHA-256: af78d41683532b4839958bf4f874f3bf34005e8fcd6982bc79c4c5c860b6f129

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