Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a556c92e57cf28…

MALICIOUS

PDF

51.4 KB Created: 2020-07-27 17:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aaa2c7158b5241f71db2bd24d316b4a1 SHA-1: 8aec40fff63a44de6e2cb85b5ac14da352c4ef3a SHA-256: b8a556c92e57cf2882fe9b1e6ae9de469118187976bdfe54fb965bd5ff9390ab
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is indicative of a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains text related to '8 ball billiards game', suggesting a lure to attract users searching for such content.

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=8+ball+billiards+game
    • http://files.nagamegallery.com/uploads/1/3/1/6/131606408/5baedfa915bf75.pdf
    • http://files.photosbyjcr.com/uploads/1/3/1/4/131437464/b9bf4dcaca76.pdf
    • http://files.atlanticseasaltcompany.com/uploads/1/3/1/3/131398332/6088b97d7d02.pdf
    • https://cdn.shopify.com/s/files/1/0434/1792/7837/files/jexizar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9467339244.pdf
    • https://cdn.shopify.com/s/files/1/0431/1410/2941/files/kosibi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2182/0313/files/bugumo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tokon.pdf
    • https://cdn.shopify.com/s/files/1/0437/6484/2657/files/80604399039.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/paxotaxazojulilinitulo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9711/2219/files/punexibaxegufagemane.pdf
    • https://cdn.shopify.com/s/files/1/0428/9229/6358/files/46598422338.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/bewirisivafodojutedotuzi.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/
    • https://cdn.shopify.com/s/files/1/0437/6484/265

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008c7d.bin
fae5699b0075b6693e7e10176ca3f4ad575a4969aaaf2addde1df39f72107e11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C7D 4876 bytes
font_01_sfnt_off00009cf4.bin
eb0ef93200c1af14d3c2ff267e246ee46e0ce54e6c8947282c650eb28a1e2f64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CF4 10436 bytes

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