Malicious PDF — malware analysis report

Static analysis result for SHA-256 831fc174c5d7244f…

MALICIOUS

PDF

58.2 KB Created: 2020-08-30 20:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fe163f997b40dc71caa8392ddd7a921 SHA-1: 826d070febecc8bc2ae5b32292b53b5c52da054e SHA-256: 831fc174c5d7244f117b4fb2418190552be499af3742bc00ea3d09e8690236b1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one pointing to a known malicious redirector (ttraff.com). The document body, though heavily obfuscated, contains text that appears to be a lure for a "Borderlands configuration tool". The presence of many external PDF links suggests a link farm or redirection strategy to obscure the ultimate destination. No scripts were extracted, but the PDF structure and malicious link indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wix?keyword=borderlands+configuration+tool
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_267a8b1477954d6d8ef18fa287a6adab.pdf
    • https://static.usrfiles.com/ugd/432b07_196df355d62045699e2211cb8f933192.pdf
    • https://static.usrfiles.com/ugd/73c254_75395f266a754cbf8889477ad0d919b4.pdf
    • https://static.usrfiles.com/ugd/39cb9d_db07130c8f00447785505d2d8c145d35.pdf
    • https://cdn.shopify.com/s/files/1/0439/4903/1592/files/firufebefizexemibutar.pdf
    • https://cdn.shopify.com/s/files/1/0435/5650/3704/files/67357390761.pdf
    • https://cdn.shopify.com/s/files/1/0430/2379/4339/files/80508218576.pdf
    • https://cdn.shopify.com/s/files/1/0450/6284/8664/files/square_root_84.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6105/files/bivogosogalubewamonivuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/57260941803.pdf
    • https://static.usrfiles.com/ugd/b8c837_2229764c12d54c46a3608358a2e1f340.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e1e337cd6fd4260911a757f1980cbd0.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c20278505c14891a2e7a81577fb5f91.pdf
    • https://static.usrfiles.com/ugd/e2c250_108c053debfd475682147893b6b4ede8.pdf
    • https://static.usrfiles.com/ugd/4d6844_bf4b507dab9e45b98b638407f7319835.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008d8e.bin
e5b23ccc86f8e41c988ea4d45a12ba31459736051f04a1a82790e3ccd6987db2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D8E 5120 bytes
font_01_sfnt_off00009f07.bin
9d417fd5bfde50aa88ffd4ca6592af119a830c67f6e062ae66e6cebf2bfb8a0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F07 14908 bytes
font_02_sfnt_off0000cda3.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA3 4324 bytes

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