Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b715e6f3a53036…

MALICIOUS

PDF

77.2 KB Created: 2020-08-30 13:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e17e0063b199f42d7bb1c2463f014cae SHA-1: 044312b39dcb5744e073a43fc37520c99229e748 SHA-256: 99b715e6f3a53036d51cef6c9e235fbdd30d8b3e2a6ba745112bb3bc1dc0ca51
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs. One prominent URL, 'https://ttraff.ru/wix?keyword=fairbairn+psychoanalytic+studies+of', is flagged as a malicious redirector. The ML classifier also strongly indicates maliciousness. The document body contains obfuscated text and a reference to the malicious URL, suggesting an attempt to lure users to a compromised site.

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.ru/wix?keyword=fairbairn+psychoanalytic+studies+of
    • https://cdn.shopify.com/s/files/1/0463/0852/4194/files/renexiwiduvita.pdf
    • https://cdn.shopify.com/s/files/1/0438/4486/2114/files/10999518226.pdf
    • https://cdn.shopify.com/s/files/1/0434/6462/2246/files/sojaxodipuwaterikomip.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/14452575897.pdf
    • https://static.usrfiles.com/ugd/b8c837_98c42a7bebad40b3bb10e7c6e3deba65.pdf
    • https://static.usrfiles.com/ugd/1d64af_2d2d23b5f39c484bb9143c41b922b088.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba1f802286d44e0090a49df6032326b3.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5569e5a44254fd6b922c71d7cbc4c88.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f4facdf0aea4479bc4ce678d697843d.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e6a3929249e468a8f60bc57758d863e.pdf
    • https://cdn.shopify.com/s/files/1/0433/5573/4167/files/55900947171.pdf
    • https://cdn.shopify.com/s/files/1/0433/7254/4150/files/poxulagumalujumepixuti.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/39925191139.pdf
    • https://cdn.shopify.com/s/files/1/0430/8706/9348/files/44777499718.pdf
    • https://cdn.shopify.com/s/files/1/0459/7127/5943/files/71438287973.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_off0000f2e7.bin
a0890a7275752761a3d24097a03a087b04b598b9c2d953717748130ecc21ab16
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E7 5440 bytes
font_01_sfnt_off00010555.bin
97fa308d0a41815b3e37713b01994c7edf1f35a31e4ffa5ac7f049092f55ea03
pdf-font-stream PDF embedded font (sfnt) at offset 0x10555 10088 bytes