Malicious PDF — malware analysis report

Static analysis result for SHA-256 94ff2fa566e8ddbd…

MALICIOUS

PDF

36.6 KB Created: 2020-08-31 09:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3654c86d0d5736cd6d97932f0436dfde SHA-1: e19bd0e66c29514f1f267fcb16888a3bc06245c7 SHA-256: 94ff2fa566e8ddbd7762e4591704ecd26c9c2e360e7f22dcd37b0411b7f4aa53
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link to a known malicious redirector, ttraff.com, disguised with a keyword related to FIFA 16 voice commands. This suggests a social engineering lure to direct the user to malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the target URL and references to other PDF files hosted on static.usrfiles.com, which are likely part of a link farm.

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=fifa+16+voice+commands
    • https://static.usrfiles.com/ugd/12daa7_d224d530c9e143909ad204c63a6f9145.pdf
    • https://static.usrfiles.com/ugd/79e0dc_1bb53ae11b2d4cafa4b5f52cd57e9a5a.pdf
    • https://static.usrfiles.com/ugd/1e32c2_e3074a9d8ad14a0cbe964ba7fd616f91.pdf
    • https://static.usrfiles.com/ugd/f515ca_d38d172bd4d44488abf01b2a882c9341.pdf
    • https://static.usrfiles.com/ugd/a467d2_9c1cd79c960149058e0454418578b5d4.pdf
    • https://static.usrfiles.com/ugd/b47706_1ed36fd74b5040bcb8d4b18942eff576.pdf
    • https://static.usrfiles.com/ugd/b58d21_c2b9befb406e490da6630eea1f6ecb96.pdf
    • https://static.usrfiles.com/ugd/ceb2e8_4c4269b060ac4903b6316426130487a0.pdf
    • https://static.usrfiles.com/ugd/af0aa9_9c28551cdc9b4248996365361912ed5b.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed2fe5c954c0403892702dc696a2b420.pdf
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/how_to_check_coordinates_in_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0445/2201/2831/files/zawudidupazoxila.pdf
    • https://cdn.shopify.com/s/files/1/0448/3029/4177/files/adobe_photoshop_7._0_smoke_brushes_free.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_off00004efc.bin
860e35a2fd5ad9cf87727da578f684d438f623b50fd5fb201b8717d221bb5548
pdf-font-stream PDF embedded font (sfnt) at offset 0x4EFC 5260 bytes
font_01_sfnt_off000060de.bin
d195aed4eebe1471e5a6dde4778b3a36c8436cfa64fb94c7ef056fd8fe66de9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x60DE 10372 bytes