Malicious PDF — malware analysis report

Static analysis result for SHA-256 281515edf1450c9d…

MALICIOUS

PDF

41.3 KB Created: 2020-08-29 04:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 187e49cbe42deef2a61873b05acea584 SHA-1: 8f745eba07215fe61e2c75f847855bf3e5f3f843 SHA-256: 281515edf1450c9da2342f81399e810a9b3b8b4b31a782b3e53f90b431daf1e6
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=que+es+poema+y+sus+partes'. Additionally, another critical heuristic indicates a PDF link farm, suggesting a coordinated effort to distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the embedded URL is sufficient to indicate a phishing or redirection attempt.

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=que+es+poema+y+sus+partes
    • https://static.usrfiles.com/ugd/b8c837_305de594db164e7fbf09200932dfe48d.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c9d57dcd7644dde94f476682f9c551f.pdf
    • https://static.usrfiles.com/ugd/b8c837_bafe44b636f941a88a8734836f0c4a9c.pdf
    • https://static.usrfiles.com/ugd/b8c837_3b33b68ca376417a96c8973ce2deac5b.pdf
    • https://static.usrfiles.com/ugd/b8c837_5cb822ae299e434eb3b96f0240690738.pdf
    • https://cdn.shopify.com/s/files/1/0434/1789/5070/files/64208892852.pdf
    • https://cdn.shopify.com/s/files/1/0431/0315/8433/files/53573128834.pdf
    • https://cdn.shopify.com/s/files/1/0437/3797/2897/files/vedic_astrology_book_in_bengali.pdf
    • https://static.usrfiles.com/ugd/b8c837_4067f030bbc34bd2a813cea1e1f03e85.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e7633e2f5d844e796006973b23c9982.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e07387318ce4705b798c2e772f050b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ec3a8206cf54e858aaf867711047b19.pdf
    • https://static.usrfiles.com/ugd/b8c837_7902245d2bbc41298be85ada6cb43531.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d8f19c115ae440c85890e15b3f8a894.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a52368b596f478d9d461d82e1e04ed9.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_off00006476.bin
0bf1449d6bb79c1f904a3f5d4e29ac03ab7bd54c3fb708116b57ad664b3a93c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6476 5096 bytes
font_01_sfnt_off000075b9.bin
36c6fd91ecf7a905049784aff28cdeb7771cc16d6900b2d4ded4ec60831176cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x75B9 10668 bytes