Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43b38b56dfed18b…

MALICIOUS

PDF

45.3 KB Created: 2020-08-30 00:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8217e91a5bf7c928ef8f9ec75740a5e SHA-1: 435a88b5dd5a83b801e840cf0aa70d8d18618598 SHA-256: f43b38b56dfed18b16edaa1cb5a55559640c9fa7e63bbe95fb0f89064bce5ee8
152 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF documents. One of these URLs, 'https://ttraff.ru/wix?keyword=flip+3+reviews', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL, suggesting an attempt to lure users to malicious infrastructure.

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.ru/wix?keyword=flip+3+reviews
    • https://static.usrfiles.com/ugd/105a8c_45f193613a064ab08f4d833e9ff02bc4.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9269d17b71a4edd87cb2a3594e3f91f.pdf
    • https://static.usrfiles.com/ugd/b8c837_681d5d5fb3eb4682a5c791d1f1f60db0.pdf
    • https://static.usrfiles.com/ugd/79cb75_2bbcd987b7e44db18a5bb71e4c73590d.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8010d0e50c94d93b985fc036080c50c.pdf
    • https://static.usrfiles.com/ugd/3e9e83_217cf7ee07114c07b819a288c6e346f8.pdf
    • https://static.usrfiles.com/ugd/d1d005_018b0ed7420d4a149d95dfbe53a5526a.pdf
    • https://static.usrfiles.com/ugd/e73fea_f420bddf6cc84352ba59531134704369.pdf
    • https://static.usrfiles.com/ugd/b8c837_3bf7263bb05a4677a9a3ee81b261f641.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb68693a3e90478bacdf1b04194693a0.pdf
    • https://static.usrfiles.com/ugd/d2cc1f_66d79cf5566b4618b8ec4e283d15a528.pdf
    • https://static.usrfiles.com/ugd/b8c837_22e15d914cc34657a0397e54a8e1e26e.pdf
    • https://static.usrfiles.com/ugd/6908d7_7c7b3c3181aa4bf08e60947ddf88b8f9.pdf
    • https://static.usrfiles.com/ugd/c83fdb_8443b6ee5b3a4188804922759a60ebea.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_off00006861.bin
9efd2e04b262783fa303ac870d2e82eeee64b1ac3fa8ebab9dca784b7e2d43ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x6861 4368 bytes
font_01_sfnt_off00007744.bin
87dc4d1e9ad0a3772c8aeccfb8e91df6403e78d5b90fe646511ae9987898fcc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7744 10316 bytes
font_02_sfnt_off00009aa5.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x9AA5 4324 bytes