Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85c380785c940e5…

MALICIOUS

PDF

46.8 KB Created: 2020-09-01 22:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10ba426e8949573d1dd16f6b13bf0eb6 SHA-1: 001223bb1cac357e6421ad336857104afd935fb9 SHA-256: e85c380785c940e572a5c0497e39dffe8ee88786d83e83fe9d783338c207fd37
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 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on 'static.usrfiles.com'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL and references to other PDF files, suggesting a coordinated effort to lure users to malicious content.

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=candle+light+punjabi+video+song
    • https://static.usrfiles.com/ugd/b8c837_c9204ac282bf45bc993e2c3fc17378d7.pdf
    • https://static.usrfiles.com/ugd/76de1a_89ca15e42b73455da9d781a444524c3e.pdf
    • https://static.usrfiles.com/ugd/b8c837_7de1f1590bbc4c48a189fd7dfd0ac847.pdf
    • https://static.usrfiles.com/ugd/934fc3_f55be382a1284e9fa1474db4c651d566.pdf
    • https://static.usrfiles.com/ugd/b41a9a_6226576afa4e447889f410bf7ba0d7ef.pdf
    • https://cdn.shopify.com/s/files/1/0432/7886/0454/files/35795039867.pdf
    • https://cdn.shopify.com/s/files/1/0436/0280/4898/files/librecad_templates_a4.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/rafivukik.pdf
    • https://cdn.shopify.com/s/files/1/0440/2357/8774/files/sr_71_blackbird_fact_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/0755/8310/files/zugenupedepofuba.pdf
    • https://cdn.shopify.com/s/files/1/0434/9735/7472/files/74498018099.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/wadafizena.pdf
    • https://cdn.shopify.com/s/files/1/0429/5717/6986/files/45939035164.pdf
    • https://static.usrfiles.com/ugd/9374a7_b0c32b0dc51d4097a8a6796aeb8f67d2.pdf
    • https://static.usrfiles.com/ugd/b8c837_a890250f56a84113a07372589ff5293c.pdf
    • https://static.usrfiles.com/ugd/c33cdb_c8d4e6ff136a44b991d452e75b46cc80.pdf
    • https://static.usrfiles.com/ugd/4d6844_cbc088ac1f5c424bb8dcbcecc103a59f.pdf
    • https://static.usrfiles.com/ugd/0286dd_e48b1ae396d840c5a8e0876bdf44a4b3.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_off000058c9.bin
73416b9da1d9e676f19a4937761d1588cca6a77a19ee32451704730c1f6ef2de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58C9 5304 bytes
font_01_sfnt_off00006ad1.bin
dc61f9a984ab9a116370b9bc4aa594501c256dee6dd459dae9d0b511b814155b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD1 13820 bytes
font_02_sfnt_off00009634.bin
27bc4b11ffcc68a683dd474a82a6a762ed7eb59bee419c99b3fa96b87260cd5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9634 16880 bytes

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