Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b37469927dfca4…

MALICIOUS

PDF

44.6 KB Created: 2020-08-03 19:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 501e5715a022e8f269e0ebb89d808242 SHA-1: 2b28f1a48c4e03212d70a568df73a7f312f97c6c SHA-256: 33b37469927dfca4cb39f8fb939aafee0754aff4120fd7ef80caf235ac5a3f01
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=the+adventures+of+tom+sawyer+pdf+with+pictures'. The document body, though heavily obfuscated, also contains this URL and other URLs pointing to potentially benign Shopify domains, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The primary intent appears to be directing users to malicious sites through these embedded links.

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=the+adventures+of+tom+sawyer+pdf+with+pictures
    • http://faritos.crossroadscustomlaser.com/uploads/1/3/1/4/131408970/dizikig.pdf
    • http://vowar.buildingbrilliantmindsonline.com/uploads/1/3/0/7/130740025/b848f8dd910e16.pdf
    • http://files.quickcleaner.co.uk/uploads/1/3/2/6/132681501/9918632.pdf
    • https://cdn.shopify.com/s/files/1/0435/5227/6632/files/first_angle_projection_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/6295/1074/files/puroge.pdf
    • https://cdn.shopify.com/s/files/1/0436/4995/8046/files/79800994847.pdf
    • https://cdn.shopify.com/s/files/1/0435/3989/0327/files/6897101412.pdf
    • https://cdn.shopify.com/s/files/1/0434/4646/8769/files/13969531272.pdf
    • https://cdn.shopify.com/s/files/1/0434/0803/1893/files/53242519497.pdf
    • https://cdn.shopify.com/s/files/1/0437/1300/3674/files/80966151658.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/jelasigugubaxepez.pdf
    • https://cdn.shopify.com/s/files/1/0431/6404/1373/files/49442117037.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23158701460.pdf
    • https://cdn.shopify.com/s/files/1/0429/1254/6975/files/jejepubufile.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_off0000705c.bin
7d32a0272d85a7f641c6513250b60007b4d7158c75c7fb76fed1e22b49d0aaf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x705C 5568 bytes
font_01_sfnt_off0000833e.bin
0124d6934d65fc3f4f5fc4b62041c7abada70267a68ab4fc079749e44a2583d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x833E 10024 bytes

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