Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d8361558c7ebc7…

MALICIOUS

PDF

42.6 KB Created: 2020-09-10 10:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df6633a626920611eb95eb46e32a77d6 SHA-1: e8f0aebea672087bbd50596df83cc29be7b98160 SHA-256: b0d8361558c7ebc76e6da524118b72d16d5a5eecb290a4ac1f6ee760f6527daa
154 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, specifically pointing to 'https://ttraff.club/wix?keyword=yahoo+finance+excel+sheet'. This URL is designed to lure users with a plausible pretext related to financial data. The document body, though heavily obfuscated, also contains this URL, reinforcing the malicious intent. The presence of numerous other links to PDF files on 'static.usrfiles.com' suggests a link farm used for SEO poisoning to increase the visibility of 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.club/wix?keyword=yahoo+finance+excel+sheet
    • https://static.usrfiles.com/ugd/e5cbe5_0ddbc3d6669e48748c4e79197c17c151.pdf
    • https://static.usrfiles.com/ugd/4bb103_8a643ae332a14df2bb257480abbe8e43.pdf
    • https://static.usrfiles.com/ugd/78c764_48415f72d2394019abaee79069577ec3.pdf
    • https://static.usrfiles.com/ugd/338562_2defd113caf44ff1b2a8a8f3be14ca1c.pdf
    • https://static.usrfiles.com/ugd/0bcf16_595380510eda4b4da8619ba0dd860812.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba3326000c4c431b9463f4676d64e347.pdf
    • https://static.usrfiles.com/ugd/c33f71_f7198b0e55a44a79b78bf9d5f127787f.pdf
    • https://static.usrfiles.com/ugd/defd8a_cb2034af023a4c42858f2b51f06abfaa.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/82864170268.pdf
    • https://cdn.shopify.com/s/files/1/0432/1034/2559/files/69163725266.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2879/files/62158436032.pdf
    • https://cdn.shopify.com/s/files/1/0439/0453/2648/files/58653285452.pdf
    • https://cdn.shopify.com/s/files/1/0437/4652/5338/files/72317365531.pdf
    • https://static.usrfiles.com/ugd/345929_1bd1b84fe1314663b835c139b348e440.pdf
    • https://static.usrfiles.com/ugd/02beb7_888991a82bff4fa3bd8ed02430c39481.pdf
    • https://static.usrfiles.com/ugd/754d94_6ad4d5a9ec3046dcb4acde762e6a9b06.pdf
    • https://static.usrfiles.com/ugd/8a419d_17f47fec1814478aa075411e777db6b4.pdf
    • https://static.usrfiles.com/ugd/e5a943_b0abf87a72c3429a927ac5441be0701d.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_off000068f3.bin
705ad6928c96bb4643d4af4f6f2deebc544b3d7c466cc581637f86b212cf9f95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68F3 4900 bytes
font_01_sfnt_off000079aa.bin
c9c04b2b54b22c50cac3eedb83c262db0c88c48793cedcc0ab770ed91c4d1b26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79AA 10440 bytes

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