Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c74e874d6a99806…

MALICIOUS

PDF

44.4 KB Created: 2020-09-04 17:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2137feabf78bab34e5a77146010759de SHA-1: 26309d1ce04b5e3a18b423cf9dd9e3406534ef84 SHA-256: 7c74e874d6a99806c3ce1e316596f294fdbe24d015b42765b792fb754a6ccd49
154 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.link, which is disguised as a health document. The document body and heuristics indicate a link farm strategy, likely to obscure the final malicious destination. The ML classifier strongly flagged this PDF as malicious, supporting the attack pattern of luring users to malicious 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.link/wix?keyword=nhs+acid+reflux+diet+sheet
    • https://cdn.shopify.com/s/files/1/0427/5542/4423/files/83608107334.pdf
    • https://cdn.shopify.com/s/files/1/0436/7391/1449/files/jeep_patriot_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/2340/8036/files/zujasagawoxizujuwi.pdf
    • https://cdn.shopify.com/s/files/1/0438/2857/6416/files/lexufeg.pdf
    • https://cdn.shopify.com/s/files/1/0433/8365/2506/files/rukugutizolesire.pdf
    • https://cdn.shopify.com/s/files/1/0429/4885/3926/files/vususozevujisinojuvufuf.pdf
    • https://cdn.shopify.com/s/files/1/0439/0685/9163/files/adosphere_1_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/4729/6922/files/robertshaw_thermostat_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/6006/0567/files/rifawotapupuruxovusufiwok.pdf
    • https://cdn.shopify.com/s/files/1/0433/9574/3907/files/xiwivevelowesepozotuve.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_a326aa62239b48c5bb046783b6885e3c.pdf
    • https://static.usrfiles.com/ugd/b80405_8acdaf8ebc174370b747dc75b0fa0199.pdf
    • https://static.usrfiles.com/ugd/3bcfef_814d1ceeecd842a3a27a6a33a656ce14.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_off00007173.bin
0b7d5f3137ca72e622125d41466d0578db719c0ef32ca790506d7ed41098b337
pdf-font-stream PDF embedded font (sfnt) at offset 0x7173 5144 bytes
font_01_sfnt_off000082f5.bin
b3da385b952592c416a55a7a15018d2c5c9e7c3fac6f6a2f76f1ab398e64b2fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x82F5 10008 bytes