Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f115d96345f5d2c…

MALICIOUS

PDF

40.5 KB Created: 2020-08-31 16:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32b4a28c1cf0485364515b1cc82bb4c3 SHA-1: 65d094964bd2ed7199bbfaaf3a0b4456ef7f831a SHA-256: 8f115d96345f5d2c9144120dad4a2b9c69f3361d29d80853dcb1ff1f13fb05d2
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.club'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF documents, likely for SEO manipulation or to host further malicious content. The ML classifier strongly flags 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.club/wix?keyword=bluetooth+usb+adapter+for+android
    • https://static.usrfiles.com/ugd/7baf93_f4654bb28ddd4f258a98fbaf74710246.pdf
    • https://static.usrfiles.com/ugd/ee6770_96f2aead6b4c46e2b1882d1e44a9d438.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf71010f633e4f8f9dcf5413e4d7993d.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9800/files/ludeveronubuvagemo.pdf
    • https://cdn.shopify.com/s/files/1/0437/5412/7521/files/kan_beveiligde_niet_printen.pdf
    • https://cdn.shopify.com/s/files/1/0434/6439/2866/files/24365860377.pdf
    • https://cdn.shopify.com/s/files/1/0438/3123/0624/files/charge_blade_guide_pc.pdf
    • https://cdn.shopify.com/s/files/1/0437/1293/8152/files/82604011000.pdf
    • https://static.usrfiles.com/ugd/58a813_c1286ebfffb34abab294a8b22674ab3c.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_f00e71af3ee045d49dbcfabf4c8f9a45.pdf
    • https://static.usrfiles.com/ugd/516574_1125ae3da45742efb26a24fd018961ae.pdf
    • https://static.usrfiles.com/ugd/3bcfef_e5b226bef714498fa43e19b59eaf0e9c.pdf
    • https://static.usrfiles.com/ugd/b8c837_9d67ec2f2de2477b96a9c3a4be8db334.pdf
    • https://static.usrfiles.com/ugd/09c3c7_764592cf84b642d0bf2e75c64ebf7308.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_off00005f85.bin
bdb18d14d36bf2a355d05c4fb1c8b82604890ff6b5d89b74573d5260c6b45eff
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F85 5316 bytes
font_01_sfnt_off00007187.bin
9349715bb200eb124c1e2eca6f80e3f8a24c6274ca1f9c46b5c673c6f3de4acb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7187 10872 bytes