Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc02fefbc9c4e062…

MALICIOUS

PDF

35.3 KB Created: 2020-08-02 13:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4eae1b4cea89d11a0a5c8edd524d07b SHA-1: 3b60ab13c092572457168c2abedc402dbfda34bd SHA-256: bc02fefbc9c4e0623a3b9690c601760da65c7b8f4a001c15f683c205ce7852a6
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=serway+physics+pdf'. This URL is likely used to lure victims into downloading further malicious content. The document body also contains this URL and numerous other links to PDF files hosted on Shopify, suggesting a link farm or SEO poisoning tactic to improve search engine visibility for malicious content. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=serway+physics+pdf
    • http://files.seminlee.com/uploads/1/3/1/8/131856392/1125105.pdf
    • http://files.artartine.com/uploads/1/3/1/4/131437147/6261767.pdf
    • http://files.cocoscafe.ca/uploads/1/3/1/6/131606687/2513548.pdf
    • http://files.purrfectfriendsforadoption.org/uploads/1/3/1/8/131856271/butugutonevero_likexuzorulu_kulopa_podunageto.pdf
    • http://files.louiskugelman.com/uploads/1/3/0/8/130873997/delurova-mevovug-kawufimo.pdf
    • https://cdn.shopify.com/s/files/1/0439/0325/4696/files/12060501066.pdf
    • https://cdn.shopify.com/s/files/1/0431/2553/8980/files/95852606854.pdf
    • https://cdn.shopify.com/s/files/1/0432/7217/5784/files/moxojebaworomitizufe.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8549/files/17972011499.pdf
    • https://cdn.shopify.com/s/files/1/0430/7537/1162/files/pofudimosakerulapipota.pdf
    • https://cdn.shopify.com/s/files/1/0432/9147/6133/files/girunopig.pdf
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/96321368684.pdf
    • https://cdn.shopify.com/s/files/1/0432/0044/6626/files/4664100131.pdf
    • https://cdn.shopify.com/s/files/1/0438/3195/1517/files/java_print_map.pdf
    • https://cdn.shopify.com/s/files/1/0437/2407/9254/files/clear_lane_freight_tracking.pdf
    • https://cdn.shopify.com/s/files/1/0436/0280/4898/files/6789236491.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/winoxilerudizixadejugo.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_off00004b54.bin
545f9e7fdea918e4ff7025e560665e0fd1b8845406d6e431f15b20d41c53b00b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B54 5508 bytes
font_01_sfnt_off00005e22.bin
d3ab08c57ba7e625ba1833dcd2c9ee491859e5a1592dd491882cc5a17b202994		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E22 10144 bytes

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