Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77856359eb866c3…

MALICIOUS

PDF

90.9 KB Created: 2020-08-14 20:40:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdeba0bfa401048d47635a23f06b8607 SHA-1: 4b5aeb6492858291003ab948ab35709cd489bfdf SHA-256: b77856359eb866c34b0a861ede918aa0df48ff5687bd6358f51e9849bd8c5cec
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=yanni+nightingale+music'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including one to 'https://cdn.shopify.com/s/files/1/0446/6409/4873/files/acca_accounting_ratios_formulas.pdf'. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the redirector URL.

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.ru/pify?keyword=yanni+nightingale+music
    • http://files.lakuyaeko.com/uploads/1/3/0/7/130775707/getomove.pdf
    • https://cdn.shopify.com/s/files/1/0446/6409/4873/files/acca_accounting_ratios_formulas.pdf
    • https://cdn.shopify.com/s/files/1/0439/8150/4670/files/paxijepetedukagutikoku.pdf
    • https://cdn.shopify.com/s/files/1/0428/3806/5319/files/alveoloplastia_simple.pdf
    • https://cdn.shopify.com/s/files/1/0428/5192/6183/files/32756210417.pdf
    • https://cdn.shopify.com/s/files/1/0433/0841/7192/files/advanced_calculus_buck.pdf
    • https://cdn.shopify.com/s/files/1/0434/6167/3126/files/ponivififunudopulabupe.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3285/files/71948424652.pdf
    • https://cdn.shopify.com/s/files/1/0436/1306/1277/files/aseptic_transfer_techniques_microbiology.pdf
    • https://cdn.shopify.com/s/files/1/0431/1675/7153/files/55917066162.pdf
    • https://cdn.shopify.com/s/files/1/0430/1442/2677/files/bifirugovegikane.pdf
    • https://cdn.shopify.com/s/files/1/0428/3580/4319/files/i_stand_amazed_chords.pdf
    • https://cdn.shopify.com/s/files/1/0435/6059/9711/files/86855276631.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/mehndi_design.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_off0001201c.bin
a4399288a131c3e7853cf3b8569ac48d8e2764984d79259c9ed5e9a84fdda623		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1201C 5076 bytes
font_01_sfnt_off00013138.bin
a9d77fad540989600b4c2ed9792ff981fe0193e5989635c99096b44fa5f2b017		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13138 14248 bytes

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