Malicious PDF — malware analysis report

Static analysis result for SHA-256 17839ad690fef60e…

MALICIOUS

PDF

39.4 KB Created: 2020-09-06 05:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1619d7a1db54a32b83cefc13b19a4699 SHA-1: 124ec95c1c5f156334a3024fa9bbc65c40cc4121 SHA-256: 17839ad690fef60e9053f2336e47a6b10950de9adaf5d7c0d32d04535f0b422b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to SEO-optimized PDF documents, a common tactic for link farms. One of the primary links directs to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the malicious URL and references to other PDF documents, reinforcing the link farm and redirection attack pattern. 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/wix?keyword=abinaya+song++mugen
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b47706_f7ef8e514a524078a601229c85c3e032.pdf
    • https://static.usrfiles.com/ugd/f967ac_e6d39f14cdd349bd81595ecc26679051.pdf
    • https://static.usrfiles.com/ugd/0049ca_94a1cf414bbe412bb1486d1bf352dd97.pdf
    • https://static.usrfiles.com/ugd/e745be_77c3ae3790c04836b0331dab4a116224.pdf
    • https://static.usrfiles.com/ugd/585b1d_459557ef83a144a8ab5432160d203905.pdf
    • https://static.usrfiles.com/ugd/784815_6765354657e24851b34cff3cbe74454d.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_767d6151c5f5445bae75c6d7ccb0e5f8.pdf
    • https://static.usrfiles.com/ugd/c33f71_599966d8a6d04b6285dca3e42c73d156.pdf
    • https://static.usrfiles.com/ugd/bf650e_d1b5ccb35d0447129db681d1da1da5e9.pdf
    • https://static.usrfiles.com/ugd/ecd213_567251f257e54ea690618a793972881c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a973b37b504147cd9253f887e3dad7d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e0823010ef84d159ac91ae40d069f73.pdf
    • https://cdn.shopify.com/s/files/1/0430/6881/7562/files/android_10_mi_a1_rom.pdf
    • https://cdn.shopify.com/s/files/1/0433/8555/3061/files/jegasexidixita.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3637/files/flat_assembler_tutorial.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005584.bin
e9d429df175618ca5b0aa7ab60a548a86888ad479152de8e63223f6a198a4f96
pdf-font-stream PDF embedded font (sfnt) at offset 0x5584 5108 bytes
font_01_sfnt_off000066e5.bin
27aaacddae1a53e93909d8f70074bf2ef3315f1cbde1358ddf4ee523e6ffcc48
pdf-font-stream PDF embedded font (sfnt) at offset 0x66E5 13528 bytes