Malicious PDF — malware analysis report

Static analysis result for SHA-256 651b324e6ea69003…

MALICIOUS

PDF

45.5 KB Created: 2020-09-06 03:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38ebd2e9fe61ced5283585039cf7f39d SHA-1: 0efdac8be7ce17195cb43aaa9b12e93a35ebb917 SHA-256: 651b324e6ea690039b9b3bc25cb62bbedb473632c2a40a84ed2698b18d144670
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to movie downloads and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=chungking+express+full+movie++480p
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/625844_b8c7a7e3ea654c54bdbd0f500926d4bd.pdf
    • https://static.usrfiles.com/ugd/f46427_16756bde17ed48c788ebffbc6c1e82a2.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e89944775ce4cac9cbbc9645d74763d.pdf
    • https://static.usrfiles.com/ugd/08fe48_94e4dda430b5463a876a22b4ac55bcaf.pdf
    • https://static.usrfiles.com/ugd/eeb7bd_e8dbb66a1e7f4d24b452759a2bce778a.pdf
    • https://static.usrfiles.com/ugd/271e65_7d62261ce28746b6ae6f7bf149b6ae25.pdf
    • https://static.usrfiles.com/ugd/de65f7_a1ae9f29d0e74f00948b2adeb9ba3381.pdf
    • https://static.usrfiles.com/ugd/b90ba1_65de2071effd4b529b6fe9faba83e357.pdf
    • https://static.usrfiles.com/ugd/5926b4_469b9548053046f6a18ea512c5b96a56.pdf
    • https://static.usrfiles.com/ugd/5b9365_37a1b34758774342a64f0b2bb4f9acdf.pdf
    • https://static.usrfiles.com/ugd/9ea91e_36189a60c400422eb6692a22e3d5741a.pdf
    • https://static.usrfiles.com/ugd/13ae68_d2f51fa6fac4479eb149d71cbe7784a1.pdf
    • https://static.usrfiles.com/ugd/822ecd_431c21e3ba30478083d4c6e98a8fe33d.pdf
    • https://static.usrfiles.com/ugd/b8c837_99c392296dbf4d24ac4d164e98b1cf7d.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060ec.bin
32f3aaac1d3adc760c300a4971c4398d811d6bd12b30e1558547359f30bbf62f
pdf-font-stream PDF embedded font (sfnt) at offset 0x60EC 5116 bytes
font_01_sfnt_off00007263.bin
629fef2bd45ad9d8b833ff90737509ed31c07d1f72b8c2f0a9a1e0cfeb0a6bdb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7263 5624 bytes
font_02_sfnt_off00008578.bin
39abb867be2bfcf2ffaf59359220bac036d641e79abb543ac37df7b08e25c5bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x8578 10340 bytes