Malicious PDF — malware analysis report

Static analysis result for SHA-256 a273866486beef35…

MALICIOUS

PDF

48.5 KB Created: 2020-07-24 11:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6855f1c8e7abbb384b046a8f1251c317 SHA-1: 283fe5f64d5ded4fef4ce2decab8de41e98738a8 SHA-256: a273866486beef35fb4282a631afcb4619beef9351a8a9f64fb9173c73fc855f
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 its inclusion of a large number of external links, a technique often used to create link farms for SEO manipulation or to redirect users to malicious sites. One such link points to a known malicious redirector. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, suggesting it's not a typical user-facing document but rather a programmatic construct for link distribution.

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=calling+app+android+github In PDF document text
    • http://files.frankhagancontracting.com/uploads/1/3/2/6/132681404/zatamutofineve.pdfIn PDF document text
    • http://files.bigairmarketingproducts.com/uploads/1/3/1/8/131871907/bf3e90b9.pdfIn PDF document text
    • http://files.horseandbird.com/uploads/1/3/0/7/130776374/4774169.pdfIn PDF document text
    • http://files.sunderland4autism.com/uploads/1/3/0/8/130814342/acaa9c4db3c2c0.pdfIn PDF document text
    • http://files.fdryabc.com/uploads/1/3/1/4/131438471/depiworuku.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/1/0430/6190/3517/files/56598997145.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6119/8491/files/20140646695.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2938/1791/files/xibolopolomokediseji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7384/6952/files/soxobijer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/6219719719.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/satofekefekuwozavobijogut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80787326618.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7513/2824/files/64047960321.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1130/8696/files/69021352725.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1844/5223/files/bulali.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5525/9560/files/43560876829.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_off00007974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7974 4972 bytes
SHA-256: 05beda3f63ab209c34af5379bd83f96cf1e42cc3fade8c8dec6847864a0f31c7
font_01_sfnt_off00008a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A41 13596 bytes
SHA-256: d67326b9e3e0f7400a23a00ce49d5eb2f9a0385184d02c67d341baafc3017248

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