Malicious PDF — malware analysis report

Static analysis result for SHA-256 173535c85f2de800…

MALICIOUS

PDF

45.1 KB Created: 2020-08-29 21:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f627c71580df5909269f7bf3c8707f5f SHA-1: b6aab249756ce956afdf12d2197b1613f35987c3 SHA-256: 173535c85f2de800309be4c66a9faa0213b89844289313dbf6ece111c231219d
154 Risk Score

Malware Insights

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

This PDF file contains numerous links, including one pointing to a known malicious redirector. The document body, though partially garbled, includes a URL that appears to be a lure for downloading a PDF. The presence of many external links suggests a link farm or SEO poisoning attempt, likely to drive traffic to malicious sites.

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=selenium+design+patterns+and+best+practices+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_fbdc8e6b6902448cb83e89134be9ba4f.pdf
    • https://static.usrfiles.com/ugd/b8c837_49de9b72dd4b4994967c082c2c7f984e.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5333afdbc4d48c2979e4d8585a24a4f.pdf
    • https://static.usrfiles.com/ugd/c7a620_7ebff66f88904b10a3f21d5ba9364725.pdf
    • https://static.usrfiles.com/ugd/0a593f_9cd9f3cd42a541b39ad8881d916bc01b.pdf
    • https://static.usrfiles.com/ugd/b8c837_33906e7b17164d1da9613f6d42afb0ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_7ae687dded894163a8793a6b9aac9a69.pdf
    • https://static.usrfiles.com/ugd/b8c837_5b35804b4e1b42b0b027bcbe58865553.pdf
    • https://static.usrfiles.com/ugd/eda9ba_5d317e705cbe43aaab65b3bf6813dcdd.pdf
    • https://static.usrfiles.com/ugd/b8c837_6fe114e92fed432bb41651a335f86c31.pdf
    • https://static.usrfiles.com/ugd/b8c837_1380a990398f4b83bc1111e9664366e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_242eacf27ca840ac8947c64a1df6c130.pdf
    • https://static.usrfiles.com/ugd/b13fd1_e193fb8cae59485b8fefe9d975a666bf.pdf
    • https://static.usrfiles.com/ugd/5ed537_968c668cddea4657a2057a48d27adae4.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_off00006609.bin
4d031725283966d7c591a7968e4bd028cd45030b720eb2e8da2e21dc61f6527f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6609 5716 bytes
font_01_sfnt_off00007953.bin
50da77f2cf225a952a7ccabd1713df7f3bbc5776aaa0f5f406076f5662298c0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7953 14668 bytes