Malicious PDF — malware analysis report

Static analysis result for SHA-256 311b3ca18c1a8105…

MALICIOUS

PDF

36.5 KB Created: 2020-08-31 00:40:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebaec3a97c1026d98ae75cb2395742d5 SHA-1: 0105d6d6e61303bbd40579119fdbfadd585f1924 SHA-256: 311b3ca18c1a810587dd9d549e51a071b0232127452c55df6bb91affb64080f4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a product link for an eyeshadow palette. This indicates a phishing attempt to lure users to malicious infrastructure. The PDF also contains a large number of external links, many pointing to static.usrfiles.com, suggesting a link farm or SEO poisoning tactic to improve search engine visibility for malicious content. No scripts were extracted, but the presence of the malicious redirector is a strong indicator 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=supernatural+monster+guide+eyeshadow+palette
    • https://static.usrfiles.com/ugd/b8c837_b7c736fcd4804bb7bf76759468bbf45e.pdf
    • https://static.usrfiles.com/ugd/b8c837_4217c47c694f461ab008ac654aa86682.pdf
    • https://static.usrfiles.com/ugd/0047a4_884d6928e7dc44b384cb1cb088b9665c.pdf
    • https://cdn.shopify.com/s/files/1/0429/9931/6639/files/dinikiniruzugaferikoji.pdf
    • https://static.usrfiles.com/ugd/2813e2_db2392266c8241e18d93393dfbe7681d.pdf
    • https://static.usrfiles.com/ugd/5b9a87_2af7e04446014e7cbb200fee371f04c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_a069e590c199413ba56d35450666b219.pdf
    • https://static.usrfiles.com/ugd/eda9ba_1146a925292b454886af2f77997c4866.pdf
    • https://static.usrfiles.com/ugd/2f8cea_dc9c5de44f984f0fbacf24240fabae63.pdf
    • https://static.usrfiles.com/ugd/b8c837_b089d3b1d70b428681402cc08f38a9eb.pdf
    • https://static.usrfiles.com/ugd/87d215_dc48038f874845f3b19efaf695ffdcb6.pdf
    • https://static.usrfiles.com/ugd/b8c837_88f9f808c7174413afa36194e9306ed1.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_off00004f66.bin
12c4a75222ae0f35b672fab74fd87b8841b67b667eae1ed195ddd9f98b6b5294
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F66 5668 bytes
font_01_sfnt_off0000628e.bin
22cdda2a1068e9929921baf7b3f58f1883df6fe06a5ac844f29262115e345aeb
pdf-font-stream PDF embedded font (sfnt) at offset 0x628E 10148 bytes