Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c0dc18332072543…

MALICIOUS

PDF

43.3 KB Created: 2020-08-06 14:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96d468b14a2db841174cd89ffa6f44df SHA-1: 7b96155649b1cc90b0395b988b76f46661411207 SHA-256: 0c0dc183320725435005e3a802c36dee02c305c3fa47a90668df12191148e390
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with 18 external PDF links, many of which point to potentially malicious or unknown domains. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.ru'. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated and contains a URL that appears to be part of the link farm.

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=carotide+externe+pdf
    • http://pilagomi.dbayna.com/uploads/1/3/1/3/131384281/31d1069d18.pdf
    • http://files.gclothingofficial.com/uploads/1/3/0/7/130739747/fazenewumolako.pdf
    • http://files.nyteched.org/uploads/1/3/1/8/131871871/3439343.pdf
    • http://torura.stlcreativecave.com/uploads/1/3/0/8/130873826/12fc3a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/6879/8614/files/99567996815.pdf
    • https://cdn.shopify.com/s/files/1/0432/1761/7057/files/87086510022.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jamitaribigonekadori.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37263727017.pdf
    • https://cdn.shopify.com/s/files/1/0429/5157/3657/files/1130972197.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/dakitirurowekeka.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84770620138.pdf
    • https://cdn.shopify.com/s/files/1/0427/9864/5404/files/master_convert_excel_to.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5138/files/zojagopedutibitawak.pdf
    • https://cdn.shopify.com/s/files/1/0428/0582/1599/files/keto_food_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6757/files/89797360660.pdf
    • https://cdn.shopify.com/s/files/1/0432/4674/7803/files/sireg.pdf
    • https://cdn.shopify.com/s/files/1/0435/7141/3160/files/chemistry_all_compound_formula.pdf
    • https://cdn.shopify.com/s/files/1/0433/9679/2471/files/penosigivumaza.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_off00006869.bin
60de0060b69d5a2b00c8cbb69d556c4770172ee885e58c45b83da3e286656952		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6869 4796 bytes
font_01_sfnt_off000078cb.bin
92253a905ce004a6b5854f14d1e5693674b71f2fbd87c763cc517b781e1ffb26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78CB 12072 bytes

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