Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3340b9571f75545…

MALICIOUS

PDF

50.1 KB Created: 2020-08-18 17:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efb32cbdc7176c4cd337fd6f991a3a8d SHA-1: bb943c6f6a0f328b33723722e53077ee6b0c7b84 SHA-256: f3340b9571f755456ed96851ecf38a3e687bc60994bed18d2d72a6ee78bd0f95
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with the primary redirector URL being https://ttraff.ru/pify?keyword=atmega328+microcontroller+architecture+pdf. This indicates a likely SEO poisoning or link farm attack pattern, aiming to drive traffic to potentially malicious or ad-heavy sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector.

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://ttraff.ru/pify?keyword=atmega328+microcontroller+architecture+pdf
    • http://files.deondurr.com/uploads/1/3/1/4/131437474/1930942.pdf
    • http://files.kellydumont.com/uploads/1/3/1/4/131410545/vebor-gotepage-rododisafinev-bomopupi.pdf
    • http://files.bcdancepassion.com/uploads/1/3/1/4/131438629/c97fd10ea3.pdf
    • http://dobasuj.thepaintbarpaintings.com/uploads/1/3/1/8/131856257/zebodoja_xotelup.pdf
    • http://files.centerforspiritualawakening.org/uploads/1/3/2/6/132681033/fesorivi_bipolanotu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8003629611.pdf
    • https://cdn.shopify.com/s/files/1/0437/3859/5482/files/mivaraf.pdf
    • https://cdn.shopify.com/s/files/1/0430/2857/8467/files/at_t_assembly.pdf
    • https://cdn.shopify.com/s/files/1/0431/3507/4465/files/6065988152.pdf
    • https://cdn.shopify.com/s/files/1/0435/8701/0715/files/palupulosonepobelez.pdf
    • https://cdn.shopify.com/s/files/1/0434/1907/4722/files/69497936208.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3097/files/19198406897.pdf
    • https://cdn.shopify.com/s/files/1/0431/4487/2085/files/46068034509.pdf
    • https://cdn.shopify.com/s/files/1/0431/2956/9434/files/blank_tri_fold_brochure_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/9928/2844/files/pearson_education_5th_grade_math_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/puniguvo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7015/3113/files/sitilujaxomefewede.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f7c.bin
9b7dc53bfc04383b1856f46725de305bec107819a8a8c24191a21bfdee240283		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F7C 5868 bytes
font_01_sfnt_off00009340.bin
b8d0507fdf87e463382fd51910761f8293e31b695590c493d33287dc46ec29dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9340 12432 bytes

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