Malicious PDF — malware analysis report

Static analysis result for SHA-256 7525c0cf8beb37a4…

MALICIOUS

PDF

45.3 KB Created: 2020-08-30 11:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f31609793777970d883aa7552568a01c SHA-1: d5f281991de8980b10ebe609fcee3599f087aeb7 SHA-256: 7525c0cf8beb37a4f1ffe511c3acfbc5337f8ac46b0d69b62d6594de2661f8e3
152 Risk Score

Malware Insights

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

The PDF document contains a lure for free game downloads, which is a common social engineering tactic. It embeds numerous links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports this assessment. No scripts were extracted, and the document body was heavily obfuscated, but the primary malicious activity appears to be redirection via the embedded URL.

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=pokemon+ash+gray+rom+free+download
    • https://static.usrfiles.com/ugd/ea9bdf_61db6b49e49b4ab3a6fac6f57b492ff5.pdf
    • https://static.usrfiles.com/ugd/ce0e6d_f1452de5ddf34ce5a15cb94eedc7cf93.pdf
    • https://static.usrfiles.com/ugd/e73fea_2c25a369965746fba33b6dc81156e433.pdf
    • https://static.usrfiles.com/ugd/0a052f_2e28a4bae63b4ab3a9d9c22220128f36.pdf
    • https://static.usrfiles.com/ugd/0c8cc8_4e110f32eb1c4746bfda672b773f11af.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ecce2c2441a42d0b8ca3ab46d43b0e0.pdf
    • https://static.usrfiles.com/ugd/b50c55_3614ff054cc74066a1eca74215eb3249.pdf
    • https://cdn.shopify.com/s/files/1/0434/7786/0516/files/telecharger_gta_v_android_aptoide.pdf
    • https://cdn.shopify.com/s/files/1/0433/4524/8407/files/mitotic_inhibitors.pdf
    • https://static.usrfiles.com/ugd/a18aa6_a4102fd8ac4f4211a0a1b0c190e0de34.pdf
    • https://static.usrfiles.com/ugd/b8c837_e62dca9eb4164cc580e4e8856dd25dcd.pdf
    • https://static.usrfiles.com/ugd/c3f88d_83f329941b2648ba944394d3f2529148.pdf
    • https://static.usrfiles.com/ugd/b8c837_0cdca71efa4d420dae24df829404ce47.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7ceaabc4d1945d08c2a6225905d296a.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_off000072bf.bin
c597b3a1c06547bcbc3b577aaeec6224d95f730b4bcee918163da3e4846cceb3
pdf-font-stream PDF embedded font (sfnt) at offset 0x72BF 5580 bytes
font_01_sfnt_off0000859d.bin
a626a71b0f53758ea37f0330dc9b01a4cb390d985dcfdcc2387537258b41b454
pdf-font-stream PDF embedded font (sfnt) at offset 0x859D 10176 bytes