Malicious PDF — malware analysis report

Static analysis result for SHA-256 3295195eec079e92…

MALICIOUS

PDF

74.7 KB Created: 2020-09-01 17:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3e4d29483ca27fad97089e0fac88d49 SHA-1: 103eaffda0d081466b23c1c59e4626003737f45b SHA-256: 3295195eec079e92882e985b416912dde35f242075994afecebbb5591eae58f8
154 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous external links embedded within its body. One critical heuristic firing indicates a malicious redirector link to 'ttraff.cc', suggesting a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious. While the document body is heavily obfuscated, the presence of the malicious URL and the link farm structure are strong indicators of malicious intent.

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.cc/wix?keyword=anabaptist+radical+reformation
    • https://static.usrfiles.com/ugd/769f78_c3d22ce5e64b4121ab94f3ea70d5914f.pdf
    • https://static.usrfiles.com/ugd/fd7405_f8bac2bf0cf14f6cb8dbf941597cbc7f.pdf
    • https://static.usrfiles.com/ugd/b8c837_20bf0c9171154a18bdc394bd83543d88.pdf
    • https://cdn.shopify.com/s/files/1/0433/9420/3806/files/holt_chemistry_textbook_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0430/9080/4885/files/czasy_przysze_angielski_wiczenia.pdf
    • https://cdn.shopify.com/s/files/1/0435/5158/8507/files/nirosafalafif.pdf
    • https://cdn.shopify.com/s/files/1/0431/7301/9808/files/76987376585.pdf
    • https://cdn.shopify.com/s/files/1/0429/2860/3295/files/ac-_15_gungeon.pdf
    • https://cdn.shopify.com/s/files/1/0437/6035/3429/files/clinical_study_protocol_synopsis_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/tovovonalokinazujepake.pdf
    • https://cdn.shopify.com/s/files/1/0432/8875/6384/files/25002529897.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_off0000e6fd.bin
ef24e6a8c072f0962276ca876ce9b39aae7fb27678f5ee3b7c01fd0779654d7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FD 5432 bytes
font_01_sfnt_off0000f957.bin
5ac63cec7e9c7e7473369d7cc83aee3201c93be7888f18cb99fbab5f3df34831
pdf-font-stream PDF embedded font (sfnt) at offset 0xF957 11516 bytes