Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b6fca22775d6d1…

MALICIOUS

PDF

43.1 KB Created: 2020-09-07 04:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f92a89ddde4524fb51994770475c8cd1 SHA-1: ddcacccbebf5d98c3dbf0b061184b9cd216ac5c1 SHA-256: 50b6fca22775d6d1d8c01d6c0643ba17d232a9891d31fab015f44b6673d62d58
152 Risk Score

Malware Insights

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

The PDF file contains a high density of embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.me/wix?keyword=pcsx2+emulator+games+for+pc+free, which is likely the primary malicious entry point. The presence of numerous other links hosted on static.usrfiles.com suggests a link farm or SEO poisoning tactic to lure users to malicious content.

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=pcsx2+emulator+games+for+pc+free
    • https://static.usrfiles.com/ugd/5e8de6_e656f7082f874efeb1d27d9655f843a0.pdf
    • https://static.usrfiles.com/ugd/a771bd_f980bb0e2bf34c8bb8f0b7c37b0c3030.pdf
    • https://static.usrfiles.com/ugd/ee6770_3fa4c423fbb94aef8e65cfefe75fe737.pdf
    • https://static.usrfiles.com/ugd/e2c250_9140bc29974d4e62af8b0fee9f333fe6.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4c5e787f2bd47cd926fb14535470c8c.pdf
    • https://static.usrfiles.com/ugd/b8c837_7254b13464f7453bb03adde8555a7a0a.pdf
    • https://static.usrfiles.com/ugd/b88e3d_9e1d0fb465574ff089ef822fa687874d.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_41636e43202d43bfb0ed703442942e48.pdf
    • https://static.usrfiles.com/ugd/bb05c1_984c9bf1e442406d932132245c7c32f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_016a29e3e94a40f4b5984c3d50536dca.pdf
    • https://static.usrfiles.com/ugd/6116da_ab8e1eefe61c455db17677779e993fdf.pdf
    • https://static.usrfiles.com/ugd/9c58c5_aa5cb618f8fa419ca1564636c1013f40.pdf
    • https://static.usrfiles.com/ugd/cb4a18_d6beb1e3eeee4c9ba5a5994abb9ca9da.pdf
    • https://static.usrfiles.com/ugd/b1b16e_7ecd1682cb654db58111198e7e1f6a95.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_off000069b8.bin
0e1e92596765b7a9b6fd394e44618319d8d781d0983c867b0ab4847407af5e6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x69B8 5536 bytes
font_01_sfnt_off00007c81.bin
e55c2fedd6f77090c27363f2669410e52d8a473cff952271d4d156f098a1b2b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C81 10284 bytes