Malicious PDF — malware analysis report

Static analysis result for SHA-256 9431a43d4f7846de…

MALICIOUS

PDF

40.2 KB Created: 2020-08-29 15:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8c1a57aef5c1cc748029d14599b3101 SHA-1: 160bda51feea7a908b7448f962a9b39bf0f04478 SHA-256: 9431a43d4f7846dee6428d594d3ef84a7abd6e20f800cd8dfe4584ed2f617e90
94 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 a URL that is likely used to host further malicious content or phishing pages. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The ML classifier also strongly indicated maliciousness. The attack pattern is a social engineering lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.
  • 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=gta+liberty+city+stories+cheats+psp
    • https://static.usrfiles.com/ugd/b8c837_104db730e1484e2db7ac9acc8edcaa93.pdf
    • https://static.usrfiles.com/ugd/b8c837_852f630569be4b92b6d446a9ead2a2ab.pdf
    • https://static.usrfiles.com/ugd/b8c837_344215e993c5403eb9505e7d16cfb44e.pdf
    • https://static.usrfiles.com/ugd/b8c837_94f3cb67255d4f0c95e1f0f6de6a604c.pdf
    • https://cdn.shopify.com/s/files/1/0434/4388/0093/files/3ds_cia_password.pdf
    • https://cdn.shopify.com/s/files/1/0428/3406/7615/files/research_in_applied_linguistics_perry.pdf
    • https://cdn.shopify.com/s/files/1/0434/2166/3397/files/21104917321.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7880/files/peliculas_de_antonio_aguilar_complet.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_off00005ef0.bin
84f7a89cacea71085c44349f182be2d131d4e76a2f6484cb0ca67d1dff42fc7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF0 5292 bytes
font_01_sfnt_off000070ef.bin
d872047053bc814f9832f6dceec62a10d6c602d92b31d4453a0eba96f1997eb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70EF 10548 bytes

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