Malicious PDF — malware analysis report

Static analysis result for SHA-256 64bbad837a084cdc…

MALICIOUS

PDF

37.1 KB Created: 2020-08-31 12:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f45f18b36ec7496acc1c68b602899cdd SHA-1: 741a399b7fbdd22ce44c13cbf85ad2c561f9557d SHA-256: 64bbad837a084cdc4d6e88b69bead887a777cbb725725aab18d4f470eba8ff2c
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.ru', which is also listed as an embedded URL. The document also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to other PDF documents. The ML classifier strongly indicated maliciousness. The presence of embedded URLs and the link farm suggest an attempt to direct users to malicious infrastructure, likely for phishing or scam purposes.

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=dank+memer+bot+discord
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/6cfc61_f73f36c2a1504934beb481a29006803a.pdf
    • https://static.usrfiles.com/ugd/3e9e83_cec3be5194384b5e8580454b6418ce08.pdf
    • https://static.usrfiles.com/ugd/defdb4_f492a4ec86e240799bbf3faf23eb4d15.pdf
    • https://cdn.shopify.com/s/files/1/0454/8090/2806/files/poxilitomewumunum.pdf
    • https://cdn.shopify.com/s/files/1/0429/5376/9126/files/15814098012.pdf
    • https://cdn.shopify.com/s/files/1/0429/9830/0823/files/ph_scale_acids_and_bases.pdf
    • https://static.usrfiles.com/ugd/b8c837_e09e6bdd62d4495cab30ac10ada34445.pdf
    • https://static.usrfiles.com/ugd/b8c837_caaba8d62c9f49278d45ca32e7757fe3.pdf
    • https://static.usrfiles.com/ugd/b8c837_d97449d974984ec58c122148a1992051.pdf
    • https://static.usrfiles.com/ugd/5b9a87_e62c110bdb5442d4a60c43005bc5c5eb.pdf
    • https://cdn.shopify.com/s/files/1/0435/9634/9602/files/37039322144.pdf
    • https://cdn.shopify.com/s/files/1/0433/9607/1578/files/accidentally_in_love_sub_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0430/8549/6482/files/70276512975.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_off0000526e.bin
f441742f7c18bf4a9db7812b4e938b9c5066e6fc4abe05a3161b4c5ec8d0402a
pdf-font-stream PDF embedded font (sfnt) at offset 0x526E 5256 bytes
font_01_sfnt_off00006440.bin
361010c7960239e7ccd401c8a4efd4e0f0b9e3841ba78b30118f4c9fefbaa124
pdf-font-stream PDF embedded font (sfnt) at offset 0x6440 10504 bytes