Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81884a6da668f58…

MALICIOUS

PDF

39.9 KB Created: 2020-08-24 06:41:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 991b8b21a8187a19164b465a568f656d SHA-1: df00fae62728a5812f0b667a7eaf0704523e6566 SHA-256: c81884a6da668f580cd1600ee395e8aa62a6b5520025a68d9e27bdf9934a6a69
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, specifically `https://ttraff.cc/pify?keyword=adobe+reader+pro+software+free`. This, combined with the PDF being flagged as a link farm and by an ML classifier, indicates a malicious intent. The document body, though heavily obfuscated, contains references to Adobe Reader and URLs, reinforcing the lure. The primary IOC is the redirector URL, which is likely used to funnel victims to a malicious 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=adobe+reader+pro+software+free
    • http://files.thetruenerdcompany.com/uploads/1/3/2/6/132695692/5951498.pdf
    • https://cdn.shopify.com/s/files/1/0430/5793/8581/files/24253974531.pdf
    • https://cdn.shopify.com/s/files/1/0431/0233/9232/files/8997669177.pdf
    • https://cdn.shopify.com/s/files/1/0433/0464/8859/files/ribbon_in_the_sky_chords.pdf
    • https://cdn.shopify.com/s/files/1/0448/4333/5837/files/ankle_sprain_exercises_kaiser.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4650/files/defadove.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9625/files/kutujo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7021/6597/files/dujufulisa.pdf
    • https://cdn.shopify.com/s/files/1/0432/9252/4700/files/30140282327.pdf
    • https://cdn.shopify.com/s/files/1/0433/9580/9431/files/43997725011.pdf
    • https://cdn.shopify.com/s/files/1/0435/3412/3160/files/56527174608.pdf
    • https://cdn.shopify.com/s/files/1/0430/7222/5442/files/bejixemon.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_off00005d29.bin
6e011ee4b327d1b592f1944e628d42031b43d7de69cb742ec30d265e6d760bb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D29 5224 bytes
font_01_sfnt_off00006f08.bin
6c0f3c53cfb0637c3bf40bb7cac53eeaf72b02e09542fcdd2c76422dbf6b88ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F08 10600 bytes

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