Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf6b0d87b30926f…

MALICIOUS

PDF

35.8 KB Created: 2020-08-28 01:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb6ec590ee6ffbbdcbfe9f0e19642b75 SHA-1: 29a753f82f92894a271e4e90afe28a78c524afca SHA-256: 0cf6b0d87b30926f92b54549e5756e80b5795e9844cd5ee2f890f77b1940e556
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to external PDF files, which is indicative of a link farm or redirection tactic. One critical heuristic identified a link to known malicious redirector infrastructure, specifically `https://ttraff.link/pify?keyword=laranja+mecanica+online+legendado+me`. The document body, though heavily obfuscated, contains this same URL, suggesting it's the primary lure. The ML classifier also strongly flagged this PDF as malicious.

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.link/pify?keyword=laranja+mecanica+online+legendado+me
    • http://files.iwcobserver.org/uploads/1/3/1/4/131407194/5431554.pdf
    • http://files.thepleiadianchild.com/uploads/1/3/1/4/131452944/bakifuxarini_lupelesi_supetanadufoj.pdf
    • http://ranaxa.lydiazervanos.com/uploads/1/3/0/7/130738638/biwunuzikoxel.pdf
    • http://files.mariamilios.com/uploads/1/3/0/7/130739330/tipoxeri-pezapiga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/0686/0187/files/9057851120.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fatexuxutul.pdf
    • https://cdn.shopify.com/s/files/1/0432/8367/7339/files/gosatekijuv.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/chemistry_textbook_grade_10_12.pdf
    • https://cdn.shopify.com/s/files/1/0429/1624/9767/files/rollable_table_roll20.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nuvororixepexovi.pdf
    • https://cdn.shopify.com/s/files/1/0437/9105/7058/files/bigivigajo.pdf
    • https://cdn.shopify.com/s/files/1/0440/4976/0421/files/zubozuzevigasazusofipokov.pdf
    • https://cdn.shopify.com/s/files/1/0439/0925/1227/files/60135639810.pdf
    • https://cdn.shopify.com/s/files/1/0464/6889/0782/files/34698680778.pdf
    • https://cdn.shopify.com/s/files/1/0434/4915/5746/files/95934384041.pdf
    • https://cdn.shopify.com/s/files/1/0434/4738/6264/files/togokox.pdf
    • https://cdn.shopify.com/s/files/1/0434/0695/0557/files/fozofupakogovevikutirofaj.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_off00004e52.bin
0297b76006d464aa49c295220eb7d3baae2c0eadce1d22ff07c90e501af2d4d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E52 5100 bytes
font_01_sfnt_off00005f93.bin
e267516518476afe473ceca1c51611fe6cc73227728b40608b4154c45591f70f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F93 10168 bytes

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