Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec14c8eed97a45d…

MALICIOUS

PDF

45.1 KB Created: 2020-08-18 16:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e61323b37cca6c4ab35e338b45a53ee5 SHA-1: cda19d3837b03f7c9d282caeedca11e4163a9018 SHA-256: 3ec14c8eed97a45d925ea5ff1c036a1063fffa38208c5e876d6165dd1f78e31c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, identified as a PDF link farm. One of these links, 'https://ttraff.ru/pify?keyword=anatomy+for+3d+artists', points to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the target URL, suggesting the primary goal is to redirect the user to malicious infrastructure.

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/pify?keyword=anatomy+for+3d+artists
    • http://files.rsvpvolunteercaregivers.org/uploads/1/3/1/4/131437087/luduguvovu-newowapimule.pdf
    • http://files.susansharpeart.com/uploads/1/3/1/6/131637562/8daa6ce46.pdf
    • https://cdn.shopify.com/s/files/1/0432/5956/0094/files/zoriwodedofapuvuwi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5366/2887/files/97493669920.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7721/files/polodajekojasujigunari.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/21473661282.pdf
    • https://cdn.shopify.com/s/files/1/0434/6665/3858/files/los_cuatro_acuerdos_toltecas_libro.pdf
    • https://cdn.shopify.com/s/files/1/0431/1669/1612/files/33055037298.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tanedikefiresemur.pdf
    • https://cdn.shopify.com/s/files/1/0433/7369/1045/files/ags_101_screen.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21617342462.pdf
    • https://cdn.shopify.com/s/files/1/0432/3957/1611/files/23096766079.pdf
    • https://cdn.shopify.com/s/files/1/0437/9715/1904/files/proform_j4_treadmills.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_off00007123.bin
5e40a239c78ac7a5b994f49ea1b82ec9428e1861c6bbbc7a920aaed0e69d68a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7123 5276 bytes
font_01_sfnt_off00008300.bin
cb5b24bbcee2eb0ea60ceedec7352c2846b57cf23a7650027493f37bbfbddee7
pdf-font-stream PDF embedded font (sfnt) at offset 0x8300 11340 bytes