Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1eca0188a3883ac…

MALICIOUS

PDF

32.5 KB Created: 2020-08-30 18:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3498c8de7bff112a8fa6d0c1a0c039f1 SHA-1: f04ba36e38e472db8f3577b319785387988ff1ba SHA-256: f1eca0188a3883acfe4c8bc5cb673ac743dcf6a80322e78a16ab1a42e30ed274
152 Risk Score

Malware Insights

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

The PDF file contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a lure related to a "Mercedes a class haynes manual pdf". The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external links, likely part of a link farm designed to improve search engine ranking for malicious content. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious classification.

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=mercedes+a+class+haynes+manual+pdf
    • https://static.usrfiles.com/ugd/b8c837_add7538f27ef41ef8c4b9fc17cef74b1.pdf
    • https://static.usrfiles.com/ugd/ca300b_f7af4d3347d542688a2e82fbdf30f834.pdf
    • https://static.usrfiles.com/ugd/b3bc21_e0d6494b55ea4ddc9dd87fa557eb9851.pdf
    • https://static.usrfiles.com/ugd/b8c837_77151b43802844539594be89dd31bea9.pdf
    • https://static.usrfiles.com/ugd/6cf0f5_0ed595453d594e89b9786989d769b86c.pdf
    • https://static.usrfiles.com/ugd/b48b60_c85f5dae88bf48edb1db4959ff4d740e.pdf
    • https://static.usrfiles.com/ugd/b8c837_09afb7bc9c834125bc5547bdd4df0aea.pdf
    • https://static.usrfiles.com/ugd/b56239_5f823260552b4003aabaef73caf28cb3.pdf
    • https://static.usrfiles.com/ugd/0aab01_4dc14fc0acad4971b572543156e06d9d.pdf
    • https://static.usrfiles.com/ugd/8ab72e_9706025b5ee740419de92f02ac377d00.pdf
    • https://static.usrfiles.com/ugd/b8c837_41401a2f0eea43b1b83d15ee84866c36.pdf
    • https://static.usrfiles.com/ugd/2274a7_e2a06fb61bfe4ae1b7109cc220297eb7.pdf
    • https://static.usrfiles.com/ugd/b8c837_6af028dd38a34b048515a74489ae655a.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_off00004317.bin
da8f7d7e66b95cf4f3f04c78a729d2b25b757d3e01782e912d917bad85b3c1b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x4317 5500 bytes
font_01_sfnt_off000055ad.bin
cc92a07962aa78e6283abb75c0badd58e4c6616090997efc6dc8fabb939afbf8
pdf-font-stream PDF embedded font (sfnt) at offset 0x55AD 9240 bytes