Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7bf5f4f5142d3e6…

MALICIOUS

PDF

51.2 KB Created: 2020-10-29 01:49:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a71a73d301249fbb3d333a9fa00acc8 SHA-1: 9e4d95f0f473dfdae8786162bdca3a838d17af20 SHA-256: c7bf5f4f5142d3e6b13406f669f23de185600df9b7e9d4452ad5743a15fb8119
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and contains a large number of embedded links, many pointing to external PDFs, indicating a link farm or SEO manipulation tactic. One URL, https://gettraff.ru/123?keyword=which+animal+has+radial+symmetry, is identified as a malicious redirector. The document body is heavily obfuscated but contains references to the malicious URL and other PDF links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://gettraff.ru/123?keyword=which+animal+has+radial+symmetry
    • https://cdn-cms.f-static.net/uploads/4371261/normal_5f88d705db2eb.pdf
    • https://cdn-cms.f-static.net/uploads/4368238/normal_5f8d2eadae003.pdf
    • https://cdn-cms.f-static.net/uploads/4369525/normal_5f986d0d445b0.pdf
    • https://cdn-cms.f-static.net/uploads/4385437/normal_5f902ecf9e36d.pdf
    • https://cdn-cms.f-static.net/uploads/4373527/normal_5f8bd7c5907e5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mijedusovineti/6978687977.pdf
    • https://s3.amazonaws.com/dogazisuze/calendar_2019_november.pdf
    • https://cdn.shopify.com/s/files/1/0492/0252/8419/files/jackie_o_sunglasses_white.pdf
    • https://s3.amazonaws.com/tetazino/9233123768.pdf
    • https://s3.amazonaws.com/vexeliku/10115146575.pdf
    • https://s3.amazonaws.com/lewuli/nagilawowoxub.pdf
    • https://cdn.shopify.com/s/files/1/0266/8163/9112/files/self_organizing_map_tutorial.pdf
    • https://s3.amazonaws.com/pazifetanegapu/basonanum.pdf
    • https://s3.amazonaws.com/tadovu/gazupatuxabimukegovobe.pdf
    • https://cdn.shopify.com/s/files/1/0435/8035/8811/files/90439517194.pdf
    • https://cdn.shopify.com/s/files/1/0492/4892/7900/files/39879499377.pdf
    • https://s3.amazonaws.com/jamokaroxoj/80891524032.pdf
    • https://s3.amazonaws.com/nuxulikiwab/ikea_loft_bed_with_desk_metal.pdf
    • https://cdn.shopify.com/s/files/1/0500/0524/6112/files/english_preposition_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0502/1876/2415/files/21924612081.pdf
    • https://s3.amazonaws.com/kigavanus/xutotave.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_off00008838.bin
f82d1e5bae4d993b3c94854a08165c7989fe722e6ce283ad986646a8b9b6fef3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8838 5292 bytes
font_01_sfnt_off00009a1e.bin
9735c3948e3e85375cd2ec1386f8064e012858c1cec755cb2f752fb5e402d7eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A1E 10996 bytes

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