Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d13c7746260890…

MALICIOUS

PDF

41.3 KB Created: 2020-08-05 06:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d32135cb2b9b99150d61ecc18b35a482 SHA-1: a847fc24665dfeca8022c56238dfd8ddf3bec3fe SHA-256: a4d13c7746260890ba4360ead90c3b3009aced3857c37928218ac21a1ab807ac
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure at 'ttraff.ru'. The document body, though partially corrupted, includes the same URL, suggesting a lure to external content. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports a malicious intent to redirect users.

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=advantages+of+autocratic+leadership+pdf
    • http://files.bartschcchs.com/uploads/1/3/1/4/131453539/4800083.pdf
    • http://files.joshualively.com/uploads/1/3/1/4/131437457/5496950.pdf
    • http://files.dedamaschool.com/uploads/1/3/1/4/131407625/wazumidepaninidev.pdf
    • http://files.tkpaintsandquarterhorses.com/uploads/1/3/1/4/131453022/sotekukol.pdf
    • https://cdn.shopify.com/s/files/1/0432/9966/8121/files/21250323080.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/38865423678.pdf
    • https://cdn.shopify.com/s/files/1/0432/0536/1821/files/kavafokubu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2195/9325/files/chemistry_of_high_energy_materials.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5682/files/tibagabuwutor.pdf
    • https://cdn.shopify.com/s/files/1/0439/4047/9144/files/deledenunaxidujara.pdf
    • https://cdn.shopify.com/s/files/1/0428/9921/0407/files/82535905520.pdf
    • https://cdn.shopify.com/s/files/1/0435/3844/8548/files/lonenoxu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5490/8071/files/dapasesuwotasawofizo.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_off0000643d.bin
c3c681f9688c8a1516423d47b69df11e9f58ada6a1e6ba5ace37770dd8d06950
pdf-font-stream PDF embedded font (sfnt) at offset 0x643D 5464 bytes
font_01_sfnt_off000076de.bin
290da23f58864611f80cb3016737be79f6f4c4f986009e6e9682763d129c9327
pdf-font-stream PDF embedded font (sfnt) at offset 0x76DE 9812 bytes