Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b7e68621fd0f23…

MALICIOUS

PDF

42.2 KB Created: 2020-08-29 13:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26688ac276a7e1a57efef98df813aadc SHA-1: 0878802658ffae58e909156e48b020f79cc8d9e5 SHA-256: a1b7e68621fd0f23c617de363c00cedfc8867e2ab3b4d4d7cc0614412af980ba
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=solar+pdf+books'. Additionally, a PDF SEO link farm heuristic indicates the presence of numerous external links, with this malicious URL being the primary one. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting a lure to a phishing or malware distribution site.

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.ru/wix?keyword=solar+pdf+books
    • https://cdn.shopify.com/s/files/1/0433/8896/0933/files/rododekazazixo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3288/files/food_adulteration_project.pdf
    • https://cdn.shopify.com/s/files/1/0435/9307/2808/files/python3_socket_eth_p_all.pdf
    • https://cdn.shopify.com/s/files/1/0437/2421/0326/files/isc_class_12_biology_practical_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/7873/8335/files/bigurufojoferawazexifuwoj.pdf
    • https://cdn.shopify.com/s/files/1/0438/2618/4352/files/63929389232.pdf
    • https://cdn.shopify.com/s/files/1/0433/4652/6361/files/26840217060.pdf
    • https://static.usrfiles.com/ugd/b8c837_44f96c6b9460485ba4599fad54b59354.pdf
    • https://static.usrfiles.com/ugd/b8c837_8db7c84df905434d967f26799a24a0c3.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_off000067a5.bin
055edf70e84ff34523667ea8f8c40c00afc063d05aca4140b194be460ffa0704		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67A5 5340 bytes
font_01_sfnt_off000079d1.bin
79e057c2a0c9ff869a1934ddcbd6e425e5d34cd64fa05f72fbfbcf38fd313855		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79D1 10216 bytes

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