Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4cad1f65f54919…

MALICIOUS

PDF

45.7 KB Created: 2020-09-10 10:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e277dd4b9f9ada4d363241f936496182 SHA-1: 161d353ed3514a5179f46ae78c327ea7a1422875 SHA-256: ae4cad1f65f549190c85e4e4b745e787bc3294ea725ee4707c60f5a7679dec75
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating it's a malicious redirector. One of the primary URLs, 'https://ttraff.me/pify?keyword=nexa+rust+script+bold+font+free', is directly associated with this redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it's a core part of the lure. The presence of numerous links to 'static.usrfiles.com' further supports the link farm heuristic.

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/pify?keyword=nexa+rust+script+bold+font+free
    • https://static.usrfiles.com/ugd/accd1f_b7861992b6b54bd689dd9ddccfe8a717.pdf
    • https://static.usrfiles.com/ugd/28b3f7_0c197f432dbb48f58a91af0c888fe50e.pdf
    • https://static.usrfiles.com/ugd/98857b_910948bd25324393a357bb8b368f7da3.pdf
    • https://static.usrfiles.com/ugd/314c35_4419297056fa4701875f171e8b5e58cc.pdf
    • https://static.usrfiles.com/ugd/12dc78_2b6b885988ef4a52a8507ecae6910bc7.pdf
    • https://static.usrfiles.com/ugd/857e61_4eb2a71f1d764eaaa211e219c111a66b.pdf
    • https://static.usrfiles.com/ugd/7041e4_e211f80536544e16aeefb678be05555d.pdf
    • https://static.usrfiles.com/ugd/bcfc12_b9d20d2aab3e42f586332bf3fa146984.pdf
    • https://static.usrfiles.com/ugd/3e87bf_ba995aa7570d4387b5a49019a0c4c928.pdf
    • https://static.usrfiles.com/ugd/0a593f_be9261ec36194293b3d4e4685d01b959.pdf
    • https://static.usrfiles.com/ugd/b8c837_40c5fd9c944a481ea9dd43ed29ba0cb3.pdf
    • https://static.usrfiles.com/ugd/07ef24_124428a810904cfb88a112489becff17.pdf
    • https://static.usrfiles.com/ugd/10cedf_ceed2e9bd6274317a096abed8ca44fb5.pdf
    • https://static.usrfiles.com/ugd/ad2ade_a9607216ab8649ed9d3e989198c3bff8.pdf
    • https://static.usrfiles.com/ugd/ace02d_5274494455e140b6a7bd0bde5ca35f64.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_off00005aef.bin
d0714a4cc1a213e718f4cd7cd7c36f7873afe27189b126ad1f8608cb14f152c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AEF 5328 bytes
font_01_sfnt_off00006d1e.bin
1305422571eda543a4feba8373de8fdc49012dccb3b4ca9732bc160b6866828b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1E 19532 bytes