Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4555e53e8e888e6…

MALICIOUS

PDF

38.8 KB Created: 2020-08-30 07:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a1ab14309e3b186c215aec2f9056f76 SHA-1: a0710f87306fcc0ec844115b2075b0e4d890b528 SHA-256: a4555e53e8e888e6a7195f83e3a9ec0501e55a9b0ab33d36a33ea61b74997c85
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised with a keyword related to yacht club membership dues. The PDF also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is designed to redirect users to harmful content.

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.com/wix?keyword=sarasota+yacht+club+membership+dues
    • https://cdn.shopify.com/s/files/1/0437/5461/9041/files/tonolisenis.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9397/files/loraine_boettner_catolicismo_romano.pdf
    • https://cdn.shopify.com/s/files/1/0430/6917/8017/files/xijani.pdf
    • https://cdn.shopify.com/s/files/1/0437/7939/1637/files/dragon_ball_xenoverse_2_unlock_super_saiyan.pdf
    • https://cdn.shopify.com/s/files/1/0434/8719/9394/files/lijofofirogenafeme.pdf
    • https://cdn.shopify.com/s/files/1/0433/1218/5494/files/74026241750.pdf
    • https://cdn.shopify.com/s/files/1/0429/9515/5105/files/a_level_biology_cell_structure_notes.pdf
    • https://static.usrfiles.com/ugd/bfbc46_af34bba5ec004263a7bb4c532fbb8934.pdf
    • https://static.usrfiles.com/ugd/df4650_73785fc9e7ed431698c500038e795c98.pdf
    • https://static.usrfiles.com/ugd/b8c837_5b60b0c50f844d458b006f84c3d5d206.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ea909af08f64bdaa4c5220f14457c2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_0f4d587ac53d4842a8a9de53f98e2172.pdf
    • https://static.usrfiles.com/ugd/f63f29_23cf9cb4f0c54c15828d85ee87672745.pdf
    • https://static.usrfiles.com/ugd/b8c837_affb6a93945c4d549595d45de0a7bee3.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_off00005832.bin
41cafac5cc410b538cd6560a8edbc50541247cd91a7a760b2e5fda44f1adb3de
pdf-font-stream PDF embedded font (sfnt) at offset 0x5832 5656 bytes
font_01_sfnt_off00006b39.bin
f775ee683be436bd76b091e94497f78c12c378617a01a3d8c3060bb1f8a3c894
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B39 10312 bytes