Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ee422bccb0156ce…

MALICIOUS

PDF

35.9 KB Created: 2020-08-29 20:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aff5c1db5f55c1aa9eab87cae26b3f63 SHA-1: 26918988f85166f9fd6c0692750708f43c4c7541 SHA-256: 5ee422bccb0156ce09bddf368e14e1e31bd70b59788c1a2d113b2f09c30050a0
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to a link farm designed to obscure malicious redirectors. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/wix?keyword=razer+mug+holder'. The ML classifier strongly indicated maliciousness, and the presence of many external PDF links suggests an attempt to distribute further malicious content or engage in SEO manipulation for malicious 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=razer+mug+holder
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/40512e_2c4dcb54d4c8444da8b0b21a022d6797.pdf
    • https://static.usrfiles.com/ugd/ce0e6d_5cff891ce7b649db84bcdfa655fb7304.pdf
    • https://static.usrfiles.com/ugd/d775a9_019a356bb2d14424b8ae6f0ad6aca50a.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_ce140013a7914df0b80ea3abf7824e1c.pdf
    • https://cdn.shopify.com/s/files/1/0431/7007/0687/files/86477972627.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2465/files/4902859677.pdf
    • https://cdn.shopify.com/s/files/1/0430/2556/3801/files/bozisolawadovesisodog.pdf
    • https://cdn.shopify.com/s/files/1/0432/7286/3899/files/81033181558.pdf
    • https://static.usrfiles.com/ugd/b8c837_580575a57c014bba9314d1ad3098713d.pdf
    • https://static.usrfiles.com/ugd/b8c837_25fa82cf29994fff8d4f43bda66b6de5.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_5e31a9a1a5754594beef20b9211e50f0.pdf
    • https://cdn.shopify.com/s/files/1/0429/5960/1830/files/bone_density_scan_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0431/1737/9745/files/divaxajewu.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_off00004c7f.bin
a32a04227604dca11dc7db5c315e9fca937c919816eced26e1c9854772864ea4
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C7F 5120 bytes
font_01_sfnt_off00005dcb.bin
715de8b9e434c0ddb393ce41dff50f2f68a6da4545d8400354c702f09c222f14
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DCB 11280 bytes