Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc11eb744c04b64…

MALICIOUS

PDF

42.5 KB Created: 2020-08-18 16:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd1597106fd043fa1780bf673d82182b SHA-1: 5ed247fa2728500a8b77e5e76e0b8f1d6701d76a SHA-256: 0dc11eb744c04b645b97aaed66b176f3412fc2221c8fb9605db57f8ebea0c6d3
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a malicious redirector URL, indicating an attempt to lead the user to harmful content. The document body, though partially corrupted, contains the malicious URL and suggests a lure related to an 'accident report'. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links points to a link farm or SEO manipulation tactic.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=accident+report+oregon+ohio
    • http://files.constructionindustryhelpline.com/uploads/1/3/1/4/131453496/rejeliwo-pafonu.pdf
    • http://files.alliesonthejourney.com/uploads/1/3/1/6/131607363/9a2d41dd.pdf
    • http://zosoxif.hoosierbulldogrescue.com/uploads/1/3/2/7/132740214/e9906523.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4041/4615/files/hoja_de_seguridad_del_acetona.pdf
    • https://cdn.shopify.com/s/files/1/0437/5855/1189/files/regcure_pro_free_license_key.pdf
    • https://cdn.shopify.com/s/files/1/0439/8107/8686/files/31833657943.pdf
    • https://cdn.shopify.com/s/files/1/0435/9746/3715/files/xisotevujaseruxiru.pdf
    • https://cdn.shopify.com/s/files/1/0429/5376/9126/files/76556970267.pdf
    • https://cdn.shopify.com/s/files/1/0432/7063/5678/files/alcoholismo_fetal.pdf
    • https://cdn.shopify.com/s/files/1/0432/2462/9411/files/xivadovur.pdf
    • https://cdn.shopify.com/s/files/1/0430/2071/4137/files/mavavexojagotixale.pdf
    • https://cdn.shopify.com/s/files/1/0430/7678/0192/files/fipuwesoxe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a48.bin
252a11c3f438358884872fee7cf83341c86e79babab42a2d4dd98e8e21abaecb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A48 4904 bytes
font_01_sfnt_off00007aea.bin
79b08cca7c4f92c86a586081ecee04fd9c7ee4bad9d44201e476556974dd3931		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AEA 10136 bytes

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