Malicious PDF — malware analysis report

Static analysis result for SHA-256 163b5bba02cdf3bf…

MALICIOUS

PDF

39.0 KB Created: 2020-08-14 19:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8401bd4e2dbd50943529a48eab1ae31f SHA-1: 009aacee2cb732ec9394f533bb7b1762da572c95 SHA-256: 163b5bba02cdf3bf5ea0fed32f900f7b6c8789b930beca49ad0c2605c2688724
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by an ML classifier and contains numerous embedded links. One of these links, https://ttraff.ru/pify?keyword=kgf+thrilling+music, points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL and a large number of other URLs pointing to PDF files hosted on Shopify, suggesting a link farm designed to distribute malicious content or engage in SEO manipulation for malicious purposes.

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=kgf+thrilling+music
    • http://files.philippecorriveau.com/uploads/1/3/0/7/130740625/2ba4a52d67.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/4642/0136/files/majotoxekebufalokapiwe.pdf
    • https://cdn.shopify.com/s/files/1/0428/7217/6796/files/49518068621.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/lv_car_insurance_certificate.pdf
    • https://cdn.shopify.com/s/files/1/0431/5067/2026/files/5799759957.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7318/files/xubipevuxawu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6159/9656/files/69657776792.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3429/files/gente_toxica_libro_online.pdf
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/80349050210.pdf
    • https://cdn.shopify.com/s/files/1/0434/2510/4028/files/scales_and_arpeggios_for_flute.pdf
    • https://cdn.shopify.com/s/files/1/0437/6851/2669/files/ganpati_atharvashirsha_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/8433/2710/files/aqa_gcse_biology_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/3095/3630/files/84641828113.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fa1.bin
3ecd97ba1aa0527e39cc31fa9a4641b62a8a4bfe1b75108f16d858162c828fbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FA1 4708 bytes
font_01_sfnt_off00005f78.bin
7ff38aa79315018083eeae6ba870f89e21108fde2dbe7a23c4af543266167ff0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F78 10016 bytes
font_02_sfnt_off000081aa.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81AA 4324 bytes

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