Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c1629a1b4edaf0…

MALICIOUS

PDF

41.6 KB Created: 2020-08-31 05:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 304d52e99d84deb88ea0a690d3bd55b0 SHA-1: 5e145ed41308a7c705d05b1f4b0b609e34c1d9df SHA-256: f8c1629a1b4edaf0e14822de442c062a86a91348f416ca6246b030ff25f3bfa2
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.cc'. The document body, though heavily obfuscated, also contains this URL. The presence of numerous other links to 'static.usrfiles.com' suggests a link farm or SEO poisoning attempt to lure users to malicious content. 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.cc/wix?keyword=guia+pokemon+rojo+fuego+islas+sete
    • https://static.usrfiles.com/ugd/73cb9e_70f734c59b3e4140b70613ce1f6c8f3e.pdf
    • https://static.usrfiles.com/ugd/b8c837_d82c4382c9d34b348a97cf3062f917ec.pdf
    • https://static.usrfiles.com/ugd/9ec29b_af83a2ddf6724493a01482d0d629b006.pdf
    • https://static.usrfiles.com/ugd/628a76_c7f04fe118e0497496a762a5d4214f8d.pdf
    • https://static.usrfiles.com/ugd/b8c837_87fc3ce6f357494f8fb2ec2520ea550b.pdf
    • https://cdn.shopify.com/s/files/1/0429/9633/4753/files/csr_racing_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0429/8529/1937/files/mopipir.pdf
    • https://static.usrfiles.com/ugd/078c79_f32a65308d2e4a9d8c1c41bc58482f64.pdf
    • https://static.usrfiles.com/ugd/ba3095_b8a3fe7331e142128a83fc611b386bea.pdf
    • https://static.usrfiles.com/ugd/3b7182_65a79d170dc24462abe8d03a5f630c1a.pdf
    • https://static.usrfiles.com/ugd/8ab72e_b3f19d011c7a4453849b2ff2462728f0.pdf
    • https://static.usrfiles.com/ugd/5cf23b_e7f9c070812a4d1da55e2d501bf353d6.pdf
    • https://static.usrfiles.com/ugd/6cfc61_7873a2e69e8543ef950e77235a7b809b.pdf
    • https://static.usrfiles.com/ugd/a18aa6_ae87b584e6be4d1ca1d15f7772e0aea2.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_off0000676f.bin
19e1fc3460a2bc130827e0bfeb565485375afdd6736388ff6c626e8caf467b43
pdf-font-stream PDF embedded font (sfnt) at offset 0x676F 5392 bytes
font_01_sfnt_off000079c1.bin
d5af234651a6bcf5f747c998a5139bc19dbfb7549bdc2f947a7c19c02ca2d62a
pdf-font-stream PDF embedded font (sfnt) at offset 0x79C1 9292 bytes