Malicious PDF — malware analysis report

Static analysis result for SHA-256 39dc7dc83386f1b7…

MALICIOUS

PDF

47.6 KB Created: 2020-08-02 09:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4021a67b2d48d389099934f9284ecb64 SHA-1: 72fdb01b812723c10d97739881f42ade350f44de SHA-256: 39dc7dc83386f1b741b1b51f2c6e569736ac98559029ba1bb65adca753c4f802
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources, indicating a link farm or SEO poisoning attempt. One critical heuristic firing identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=aphorism+literary+definition'. The document body, though heavily obfuscated, also contains this URL and numerous other links to Shopify-hosted PDFs, suggesting a lure to download further content or visit malicious sites. No scripts were extracted from this sample.

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=aphorism+literary+definition
    • http://files.joningephoto.com/uploads/1/3/2/8/132815054/kagekivupes-finew-wonunevumijex-tuxuka.pdf
    • http://files.zportman.com/uploads/1/3/0/8/130874627/nejajedozufejanoxifi.pdf
    • http://files.hopsbrewbeer.com/uploads/1/3/2/6/132695301/7276788.pdf
    • http://files.ucfilter.com/uploads/1/3/1/6/131606901/zexowelela_xepadibuzemujuk_zavuf.pdf
    • http://files.embodiedrelationshiptherapy.com/uploads/1/3/1/4/131483281/023158.pdf
    • https://cdn.shopify.com/s/files/1/0429/0415/8364/files/python_list_slicing.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/12158465248.pdf
    • https://cdn.shopify.com/s/files/1/0432/6978/3720/files/dujalugalitojoxugatawe.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6566/files/21419037984.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0888/files/33254804398.pdf
    • https://cdn.shopify.com/s/files/1/0436/0667/1517/files/68125024331.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/23515215170.pdf
    • https://cdn.shopify.com/s/files/1/0428/1440/6823/files/5405728709.pdf
    • https://cdn.shopify.com/s/files/1/0431/2779/9969/files/pokuzozevudimawaxeriw.pdf
    • https://cdn.shopify.com/s/files/1/0436/2646/3385/files/tixosodasomivafoposu.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_off0000784a.bin
e9716254fc6ff0ac6b6acc5ea883b674e09d9d5991bf939095c46d05fd8e739c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x784A 5372 bytes
font_01_sfnt_off00008a6c.bin
de391a2b6a5a67d5b8385a4e82e57bc1966299dde3bf89c797f8daab812de776		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A6C 11492 bytes

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