Malicious PDF — malware analysis report

Static analysis result for SHA-256 250d6b1d52e1e907…

MALICIOUS

PDF

101.5 KB Created: 2020-08-25 20:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 066251e9c9d0bcc68cfdc11c01cf7f53 SHA-1: c3f6aa35ee5286d316c670defd9c186f3e3069f1 SHA-256: 250d6b1d52e1e9078d2d59d8a35bb5d080f09a9c44dacbdcc3980a95cec0cdb8
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links, including one to a known malicious redirector infrastructure at 'ttraff.cc'. The document body, though heavily obfuscated, contains a string that appears to be a lure related to game cheat codes, which is then followed by the malicious URL. The presence of a link farm and the ML classifier flagging this PDF as malicious strongly indicate a malicious intent, likely to redirect users to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.cc/pify?keyword=borderlands+pre+sequel+weapon+codes
    • http://files.prettygirltomboybyecodesign.com/uploads/1/3/1/4/131408369/rojigodono.pdf
    • https://cdn.shopify.com/s/files/1/0437/1234/8315/files/checkout_branch_github.pdf
    • https://cdn.shopify.com/s/files/1/0464/0381/3531/files/lajewoxapotorokufiki.pdf
    • https://cdn.shopify.com/s/files/1/0432/7564/9180/files/89511599478.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zonixalekena.pdf
    • https://cdn.shopify.com/s/files/1/0433/2286/7880/files/41913747942.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/73121007565.pdf
    • https://cdn.shopify.com/s/files/1/0436/5041/6793/files/java_word_count.pdf
    • https://cdn.shopify.com/s/files/1/0431/0456/7450/files/important_days_for_bank_exams.pdf
    • https://cdn.shopify.com/s/files/1/0433/7850/7934/files/81578818529.pdf
    • https://cdn.shopify.com/s/files/1/0438/1641/9488/files/bank_exam_syllabus_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0206/8131/files/zygomaticomaxillary_complex_fracture.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_off000147f6.bin
8768a6b032b99dc2531f571323cf08266e67c77b4f0a61061efd353f029e3caf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147F6 5332 bytes
font_01_sfnt_off00015a35.bin
a85b498cc8c693d6e9c7653ece38fff25b23783261b1351ca231681449fe3269		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A35 14960 bytes

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