Malicious PDF — malware analysis report

Static analysis result for SHA-256 925667e3afb5aadd…

MALICIOUS

PDF

46.2 KB Created: 2020-08-15 12:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a82affe6348dee84844fe1f5a53061cf SHA-1: d4caeef28efce47c0d472c74cc32c01e79e78cd1 SHA-256: 925667e3afb5aadd061fb6999775a731a72963e9b4afea0314090c5f5b39c825
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=bluestacks+3++win+xp'. This indicates the document is designed to redirect users to malicious infrastructure, likely for phishing or malware distribution. The presence of a large number of embedded links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to improve search engine visibility for malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=bluestacks+3++win+xp
    • http://files.nickpateras.org/uploads/1/3/2/7/132710655/d914f150ae.pdf
    • http://files.metis8.com/uploads/1/3/1/0/131069781/e218f.pdf
    • http://files.metis8.com/uploads/
    • https://cdn.shopify.com/s/files/1/0432/8502/0827/files/attractor_factor_italiano.pdf
    • https://cdn.shopify.com/s/files/1/0430/5630/0186/files/kominedaralibaxagumip.pdf
    • https://cdn.shopify.com/s/files/1/0447/7186/8821/files/autoclave_in_microbiology_lab.pdf
    • https://cdn.shopify.com/s/files/1/0437/5147/3303/files/82454732298.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3464/files/49146425679.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3845/files/formacion_de_placas_de_ateroma.pdf
    • https://cdn.shopify.com/s/files/1/0432/5559/5172/files/lelirejoruwafiromarudak.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/nenezuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/xuriwomodoturabep.pdf
    • https://cdn.shopify.com/s/files/1/0428/9065/7951/files/anterior_cerebral_artery_syndrome.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52733892229.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/84301772800.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_off00007761.bin
bff0b22193fc4361ae8cfcb1a0c062f98f9165ec10312b341056f05742c992d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7761 5268 bytes
font_01_sfnt_off00008972.bin
34f38dbd77253b88708d8019b2a947e82bc5341b8e29ab4fa7d8db7de05fb7bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8972 10416 bytes

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