Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37d62bc6b37a58b…

MALICIOUS

PDF

58.1 KB Created: 2020-07-30 06:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c66b7e286024bc2e6fa28171b3256930 SHA-1: 810bab644fd25bdb244f788ff269c3957f4b7b12 SHA-256: b37d62bc6b37a58b506aa84b91bca2f9bcd2eeff3324cf408d10db3b19569d43
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in Systems T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier and contains numerous embedded links. A critical heuristic identified these links as part of a link farm, with one specific URL pointing to known malicious redirector infrastructure. The document body appears to be heavily obfuscated or corrupted, preventing a clear understanding of its intended 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.com/pify?keyword=acca+f9+becker+pdf In PDF document text
    • http://files.westernenglishsetterclub.org/uploads/1/3/1/4/131437693/2479888.pdfIn PDF document text
    • http://files.gulfbreezerotary.com/uploads/1/3/0/8/130813730/7614832.pdfIn PDF document text
    • http://files.iscypaa.org/uploads/1/3/1/0/131070618/ba8d99a02dd.pdfIn PDF document text
    • http://files.americanreclaimedfloors.com/uploads/1/3/2/6/132695434/7287769.pdfIn PDF document text
    • http://files.elementsandtides.com/uploads/1/3/1/4/131454304/715723af9c5.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/1/0433/0687/7080/files/tujekozovazufurujujazer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4519/9784/files/paxowik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2397/2005/files/tisopubugoxubisolon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2839/7727/files/12319595456.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9679/3503/files/71378326281.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3429/6988/files/52265335516.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0629/5201/files/93334572562.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jisabisagubimebusogapasof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6486/6469/files/fakujuvedadowuguvovuzuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3849/9235/files/tixenupazizides.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nisexabidubukov.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_off0000a5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5C9 4732 bytes
SHA-256: 84b0d8504ba2dbb32b1e26bd0e8b885193f6e2bbda8d862bc63600a550fb2c17
font_01_sfnt_off0000b5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DF 11108 bytes
SHA-256: 657fca0968a9c7616aaf28585c3909e66bdaab772ff82f9b218b8216946bf296

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