Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a72e40cc94ccc8…

MALICIOUS

PDF

42.6 KB Created: 2020-09-01 09:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4069926642de21901eceb6fb6fd4012 SHA-1: 79428add9821bb70c69cdb84164cb30dded77891 SHA-256: e8a72e40cc94ccc857a73d9dc4f0fa9be135925f58f5931c93aa87d6d9f1b225
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a "photo beautify app". The document also contains a large number of embedded links, many pointing to static.usrfiles.com, which is flagged as a link farm. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be social engineering via a deceptive link.

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=photo+beautify+app
    • https://static.usrfiles.com/ugd/b8c837_b857d160b8a548139d7d13d2f8368409.pdf
    • https://static.usrfiles.com/ugd/67e251_0c2871c982c54348b4edbf477ee88253.pdf
    • https://static.usrfiles.com/ugd/ca32a8_6317925c561b4fbb9c1525eef95fd493.pdf
    • https://static.usrfiles.com/ugd/96768c_5a752c25ccd04ed399a3e254b480d0a6.pdf
    • https://static.usrfiles.com/ugd/fd30ac_ce254259459a4c94a112bdc8964e63a1.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8448/files/vibijozudakome.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zipepatijexozuzazes.pdf
    • https://static.usrfiles.com/ugd/e02969_e06c9b72966d408abbb8a77dec53b8c0.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_60925b77fb35493199a793e5ecc9b8cc.pdf
    • https://static.usrfiles.com/ugd/3ceeb9_7568a745bbaa499abc08453a0467df9d.pdf
    • https://cdn.shopify.com/s/files/1/0438/4171/6389/files/dudav.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8095/files/55866699993.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_off000069e8.bin
06e2fe6bda28fcd465d3c77b9eff2e23ca6e1aea59b670792be670bf8a692b46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69E8 4928 bytes
font_01_sfnt_off00007aba.bin
867e0af9d95b9fff72f15a178e20c8dc35707590aa823463d91b2d45645db0f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ABA 10332 bytes

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