Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9047fcd3b4424e…

MALICIOUS

PDF

49.2 KB Created: 2020-09-02 17:40:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0853c41fcecc61a0d89c743f3739da22 SHA-1: 39e9f54446bd6b4a2964bd07b6ddd7fdf55d8eb5 SHA-256: dd9047fcd3b4424e5cd1c9065c2344144d0a550c64594dfcd5be6b7af5a1aa90
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.me/wix?keyword=bootstrap+3+column+responsive+template'. Additionally, it exhibits characteristics of a PDF SEO link farm, with numerous links to external PDFs hosted on domains like 'static.usrfiles.com'. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing the lure. The ML classifier also strongly flagged this PDF as malicious.

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.me/wix?keyword=bootstrap+3+column+responsive+template
    • https://cdn.shopify.com/s/files/1/0431/4421/6730/files/23887849700.pdf
    • https://cdn.shopify.com/s/files/1/0434/5613/5334/files/windows_10_hardening_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/5249/8070/files/52481734026.pdf
    • https://cdn.shopify.com/s/files/1/0437/7726/1729/files/canciones_para_tocar_en_guitarra_acustica_faciles.pdf
    • https://static.usrfiles.com/ugd/87fdc7_5658ce81ecd34aab9bf46941f2382465.pdf
    • https://static.usrfiles.com/ugd/7008f3_4409fbd37c8d4c5abfdd9380741d5634.pdf
    • https://static.usrfiles.com/ugd/0e9fc2_436e2b443e2041cd9c16c35a5a52abef.pdf
    • https://static.usrfiles.com/ugd/0047a4_dab4dc1338da46f286eb582661686d46.pdf
    • https://static.usrfiles.com/ugd/4bb894_b6ba923eb0814e589cbc961472fe8083.pdf
    • https://static.usrfiles.com/ugd/ec0c41_ad50b3820c1d4988a5b73af42887a7d9.pdf
    • https://static.usrfiles.com/ugd/b88e3d_46b9479a011448198954ea698bded108.pdf
    • https://static.usrfiles.com/ugd/286fb8_4b0b120770da4f92bbf0eb84cddf34ea.pdf
    • https://static.usrfiles.com/ugd/b8c837_fcd7010f44864e0495c381b9c7c8127f.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_off0000725a.bin
d0035634a1889bf2a543c593d6b12ebc433399f4188a1ecf4058a4a3d4f33ae6
pdf-font-stream PDF embedded font (sfnt) at offset 0x725A 5236 bytes
font_01_sfnt_off0000840a.bin
b81ef40b41b118e4be1b5c223e838071e7dfab024fdde8790f82b1dbb2769b5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x840A 11560 bytes
font_02_sfnt_off0000a96e.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0xA96E 4324 bytes