Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4aa99847d1efe96…

MALICIOUS

PDF

43.6 KB Created: 2020-08-30 04:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa3198048aefa4560d249ea7eafb25f5 SHA-1: a573dbd59a4900b0426dbce0890ba3c76c87a218 SHA-256: e4aa99847d1efe963610cc1777c7f806d2c91e54ba24812ab60265ebdb972e60
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that points to a redirector, which is likely intended to lead users to malicious content or spam pages. The presence of numerous embedded links supports the attack pattern of a link farm designed to generate traffic or distribute malware.

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.ru/wix?keyword=postgresql+architecture+diagram
    • https://static.usrfiles.com/ugd/b8c837_0a099aa030a84d0eb09d07f9fefb500f.pdf
    • https://static.usrfiles.com/ugd/77d535_32fc66af9608450892dd537a785e3594.pdf
    • https://static.usrfiles.com/ugd/e5a943_9d1b9a55eaf144fcb4114d17a542fe9c.pdf
    • https://static.usrfiles.com/ugd/b8c837_23bc1e9f24024887a160d64430be2cb8.pdf
    • https://static.usrfiles.com/ugd/b8c837_0314d0e1cfe2499887db052a0064d812.pdf
    • https://cdn.shopify.com/s/files/1/0434/5702/0056/files/linked_list_python.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84113106953.pdf
    • https://cdn.shopify.com/s/files/1/0440/0673/6037/files/carrom_rules_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/7026/6273/files/mejedoperitirovizawaxifot.pdf
    • https://cdn.shopify.com/s/files/1/0434/6442/5634/files/vogefasubumolir.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed9760caa78041888ba70a56e72639cb.pdf
    • https://static.usrfiles.com/ugd/585b1d_d9d9bbd20da0402bb9020869d5035f5a.pdf
    • https://cdn.shopify.com/s/files/1/0437/2047/4779/files/sting_dessert_rose_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0428/8679/1334/files/popular_korean_girl_names.pdf
    • https://cdn.shopify.com/s/files/1/0432/8567/6188/files/wamosof.pdf
    • https://cdn.shopify.com/s/files/1/0438/4089/7181/files/blockchain_for_dummies_free_download.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_off00006d6c.bin
fb0141a721ceb9ca8a93600e2eaf25b320a2d02344693f12e6835332d7e008e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6C 5480 bytes
font_01_sfnt_off00007fd8.bin
bf2dada7f9535cd4f738a7badc927b3730bd492446ae0cb0732dc10f7d0fbe8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FD8 9832 bytes

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