Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff27f9788a20dab…

MALICIOUS

PDF

36.4 KB Created: 2020-09-07 17:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 481fbcf271b63191eb3932d6a511cefd SHA-1: 567a58451de2e83947919936a41b981b025c59d1 SHA-256: 5ff27f9788a20dab461ac220c3103d1a3983ef9f1e4ce32ca784f93555f6a11b
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The embedded links likely serve to direct the user to malicious content or phishing sites, masquerading as helpful Excel formula information.

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=formule+arrondir+au+sup%25C3%25A9rieur+excel
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3368/8226/files/85261621947.pdf
    • https://cdn.shopify.com/s/files/1/0428/0185/6668/files/nojep.pdf
    • https://cdn.shopify.com/s/files/1/0436/3167/3504/files/pitobenufomonuwapameli.pdf
    • https://static.usrfiles.com/ugd/b8c837_614dab093aae428c81c5799293fc0278.pdf
    • https://static.usrfiles.com/ugd/30e015_c4ba0e91ca6544828a9512b67b83e634.pdf
    • https://static.usrfiles.com/ugd/55cc32_6bc22a1ca66448e583afb3cf6e9e6fcb.pdf
    • https://static.usrfiles.com/ugd/a76634_af85a27fd40240c68937fea97ff8adbb.pdf
    • https://static.usrfiles.com/ugd/b8c837_668e81b89e9741bb83929efce7f71966.pdf
    • https://static.usrfiles.com/ugd/71fd01_1788fd8f0249489db85bddbea2699ddb.pdf
    • https://static.usrfiles.com/ugd/0c268c_280de69b7e374776990e3c6b6c5df03a.pdf
    • https://static.usrfiles.com/ugd/a771bd_697ba337b17042dfb69454f4a0701568.pdf
    • https://static.usrfiles.com/ugd/9b5f63_48830b2ef9b34e6bb0e44a80707e0833.pdf
    • https://static.usrfiles.com/ugd/40336e_014d2bf261044c87ade35ce9f6874373.pdf
    • https://static.usrfiles.com/ugd/39a0fd_71e1afe981aa4c0cbf4979f4a6797232.pdf
    • https://static.usrfiles.com/ugd/7dd30d_331494eac814467daedd7bbad20e2dfb.pdf
    • https://static.usrfiles.com/ugd/b8c837_3716386159e84bb3a521068b19b856cb.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_off00004dba.bin
d9735e7ce0af004d7380fc41883abbea8f82ac9a4750be4d9188b7dec45dd054
pdf-font-stream PDF embedded font (sfnt) at offset 0x4DBA 5384 bytes
font_01_sfnt_off00005fb4.bin
c86beca5f9ff67c706246c3ac1f813b3c382e802d6e0ffd565255bf4ec817c41
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB4 10844 bytes