Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e8f6fe21b8c487…

MALICIOUS

PDF

49.8 KB Created: 2020-08-29 10:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecbb599629ed14ab5ac5d51d86e95f93 SHA-1: e7953d69c3783251bd7de4f625c27256c26bac7f SHA-256: d4e8f6fe21b8c4878967e405fa30cf65810c6aaf9ba3cedea2208eee0aedd65b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.com) and are presented as part of a link farm. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the primary malicious URL. The presence of numerous links suggests an attempt to distribute malicious content or lead users to phishing sites.

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=jane+schaffer+outline
    • https://cdn.shopify.com/s/files/1/0431/0066/8065/files/vanixu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6582/7747/files/wobedubosafexunisog.pdf
    • https://cdn.shopify.com/s/files/1/0431/2170/5124/files/western_powders_reloading_guide.pdf
    • https://cdn.shopify.com/s/files/1/0454/0337/3736/files/melopati.pdf
    • https://cdn.shopify.com/s/files/1/0461/9013/3406/files/template_letter_of_intent_business_partnership.pdf
    • https://static.usrfiles.com/ugd/b8c837_41934b2beee5442ca25610b90fd6c930.pdf
    • https://static.usrfiles.com/ugd/b8c837_794bed3fc8df4cb7b94b22a5916b1580.pdf
    • https://static.usrfiles.com/ugd/b8c837_8966cdd46d774439b8575ae65da3d8bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_58fdfc4a8f1b44278fbdad7c90667232.pdf
    • https://static.usrfiles.com/ugd/b8c837_ac4be774ca5b438e9e2f23ee1d73a232.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed9760caa78041888ba70a56e72639cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a1f6474fed54c249223072402c99dc0.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fb4484087e64ace9d7fdfd0b98e83e3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079c4.bin
2c8feafc42e44ebd435010bf0fa4a85a55d584f9b315e7426ee3b6c55b71fec5
pdf-font-stream PDF embedded font (sfnt) at offset 0x79C4 4840 bytes
font_01_sfnt_off00008a23.bin
d2d03f0974b2751839237d3cd8457d7b6733ea9b4586e548765d23e9f9b204fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A23 10152 bytes
font_02_sfnt_off0000acda.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xACDA 4324 bytes