Malicious PDF — malware analysis report

Static analysis result for SHA-256 a166c926d05f5d8d…

MALICIOUS

PDF

42.7 KB Created: 2020-08-08 13:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f01896660aa786e27362a20b8b323256 SHA-1: 88a47ff87540650c58fb46a3c6b487fb52a923a5 SHA-256: a166c926d05f5d8de23ad3fcfc6cb1d967c908f2ee8f41afea9f1e8b63819300
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'word to pdf reduce size' and the wkhtmltopdf tool, suggesting a lure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly indicate malicious intent, with the primary malicious URL being https://ttraff.com/wb?keyword=word%20to%20pdf%20reduce%20size. The ML classifier also flagged this PDF with high confidence.

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/wb?keyword=word%20to%20pdf%20reduce%20size In PDF document text
    • http://files.wviolin.com/uploads/1/3/1/6/131607229/1972041.pdfIn PDF document text
    • http://files.rbkaromatherapy.com/uploads/1/3/1/3/131398141/pijadova.pdfIn PDF document text
    • http://vekas.theoldpoorfarm.com/uploads/1/3/1/4/131483281/wivifosisep.pdfIn PDF document text
    • http://files.parksummerprograms.org/uploads/1/3/2/7/132740378/781344.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2569/4883/files/barcelona_bus_tour_map.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4047/2214/files/45013240260.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/lovinuwurete.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupenase.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1415/2607/files/95197592152.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5136/8104/files/53127675185.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6622/0956/files/desobavalusod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/43957854569.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/tajapi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32823332632.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0094/7103/files/4602388030.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5808/3493/files/da_form_5172_r_fillable.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D99 4744 bytes
SHA-256: d6d11a5c10f3e99ad13b6146636bc24deacab58bbd3d2149221c69c100ed12b2
font_01_sfnt_off00006df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF0 9932 bytes
SHA-256: 4fc78512881dcbee249b4b4d29bee6932319e736086f0ef2dfe05354c56bbdfe
font_02_sfnt_off00008fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FEE 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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