Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca7a94cbfecafeb…

MALICIOUS

PDF

48.3 KB Created: 2020-09-01 02:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2034845009da8ed1a9fec584ae9a8fb1 SHA-1: 7639ff7c4c30f73c6299550088b79549a259031a SHA-256: 5ca7a94cbfecafeb8171ff4bcaddfe3c3525a29107efae9544587828c1ec7619
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.ru/wix?keyword=word+save+file+as+template, is identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to saving Word files as templates, likely to trick users into clicking the malicious link. The ML classifier also strongly indicated maliciousness.

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=word+save+file+as+template
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/7098/8196/files/10238702723.pdf
    • https://cdn.shopify.com/s/files/1/0441/0903/7720/files/xilejusu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2553/8980/files/79243450702.pdf
    • https://cdn.shopify.com/s/files/1/0435/4765/6351/files/26442141065.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5485/files/ren_c3_a9e_felice_smith.pdf
    • https://cdn.shopify.com/s/files/1/0428/9206/6975/files/55105750712.pdf
    • https://cdn.shopify.com/s/files/1/0435/6443/3566/files/kadamuwun.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf9afa210ccd4576ace0f8eb31f8251d.pdf
    • https://static.usrfiles.com/ugd/b8c837_818fe1d25b1149c4bd0ae8845076063f.pdf
    • https://static.usrfiles.com/ugd/dd6616_646d33f962e74aa5a66abc1a7016f5bf.pdf
    • https://cdn.shopify.com/s/files/1/0436/7345/2697/files/hereward_college_ofsted_report.pdf
    • https://cdn.shopify.com/s/files/1/0429/2558/8639/files/assembler_photoshop.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_off000071d1.bin
7b0b159ca7e4c6308ff233c86e51d820e521ae6b9ad94f7327ddc501696c68be
pdf-font-stream PDF embedded font (sfnt) at offset 0x71D1 4944 bytes
font_01_sfnt_off000082b8.bin
71cc17fb7d40b84bffaeb8834f7d823f78bd049be089f22c78e15968dd4af642
pdf-font-stream PDF embedded font (sfnt) at offset 0x82B8 10228 bytes
font_02_sfnt_off0000a5be.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0xA5BE 4324 bytes