Malicious PDF — malware analysis report

Static analysis result for SHA-256 b935ea8e1e36579d…

MALICIOUS

PDF

43.8 KB Created: 2020-08-30 11:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15c9c46e12597bf579adf1bba0f8cee0 SHA-1: fe7f6416ade00c139788d2463866c696ebd06c69 SHA-256: b935ea8e1e36579dc4b033a7cf17b46a4556b0b3f04b55d0a83fe74681be8181
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to ttraff.com. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of numerous other links to static.usrfiles.com indicates a link farm strategy, likely to obscure the malicious destination. No scripts were extracted, and the PDF structure itself does not indicate further malicious activity beyond the redirection.

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.com/wix?keyword=c%25C3%25A1ch+h%25E1%25BB%25A7y+d%25E1%25BB%258Bch+v%25E1%25BB%25A5+b%25E1%25BA%25A3o+hi%25E1%25BB%2583m+b%25E1%25BA%25A3o+t%25C3%25A2m+an
    • https://static.usrfiles.com/ugd/b8c837_d2a0d872d3a7454e8ce9df9342e8e8b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_239e84ec9ba74095b28d89f3733aafcd.pdf
    • https://static.usrfiles.com/ugd/b8c837_82af11890f774fe18371512c7932ec58.pdf
    • https://static.usrfiles.com/ugd/b56239_375bb7cdf62c454f8479ad3a54562782.pdf
    • https://cdn.shopify.com/s/files/1/0432/3373/8911/files/10405751085.pdf
    • https://cdn.shopify.com/s/files/1/0440/7151/8373/files/wevosawuranisulelilajix.pdf
    • https://cdn.shopify.com/s/files/1/0433/9705/4631/files/97316590959.pdf
    • https://cdn.shopify.com/s/files/1/0459/8920/0029/files/rogue_one_a_star_wars_story_torrent.pdf
    • https://static.usrfiles.com/ugd/bfbc46_bd43ab5a32ab47dd9e96fc7b2d775b03.pdf
    • https://static.usrfiles.com/ugd/451461_900a6ed0a2de44a3a89d197d6eeba4af.pdf
    • https://static.usrfiles.com/ugd/b8c837_13cff52808c341408d9d2ff4f2ff97d2.pdf
    • https://static.usrfiles.com/ugd/10e3af_e9059f5789674d44b2597f0758bf5440.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/chat_alternative_app_free.pdf
    • https://cdn.shopify.com/s/files/1/0448/2190/5570/files/47185882212.pdf
    • https://cdn.shopify.com/s/files/1/0432/1512/6685/files/ambassadors_choir_video.pdf
    • https://cdn.shopify.com/s/files/1/0437/9354/7424/files/block_launcher_pro_apk.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_off00006037.bin
b9e0ad56a76ad39476b2e6c258dad02b52b36646c0710a6269c0876a426f8aa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6037 6348 bytes
font_01_sfnt_off0000730f.bin
e74468f88ba3d792eac837aa492dbf887f2d3c866c94fe9b5c5f2356a67643a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x730F 20456 bytes

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