Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a3a96ba49863c68…

MALICIOUS

PDF

46.4 KB Created: 2020-08-18 14:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24afd0b014f0bebc2b26732e75b281a1 SHA-1: e3b3e7bb6f846c0ffd39d7d8b742a3d4293f8354 SHA-256: 9a3a96ba49863c68c1fa369f0943a92963df4d2c5fd47b7e790128e78bbc54e9
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to SEO-optimized PDF files hosted on Shopify. One of these links, however, redirects to a known malicious URL (ttraff.ru). This suggests a phishing or malicious redirection attempt, likely to lure users to a compromised site or to download further malware. The ML classifier also strongly indicated maliciousness.

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=carte+de+visite+format+10x15
    • http://nevafapil.obliteratipress.com/uploads/1/3/0/7/130775519/1772810.pdf
    • https://cdn.shopify.com/s/files/1/0433/5176/9247/files/30737296097.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/careless_whisper_tenor_sax.pdf
    • https://cdn.shopify.com/s/files/1/0433/2873/3352/files/the_cask_of_amontillado_summary.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0421/files/monurixox.pdf
    • https://cdn.shopify.com/s/files/1/0437/9744/6816/files/feedback_amplifiers_design_oriented_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5400/files/anhedonia_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0429/6281/3084/files/jenuli.pdf
    • https://cdn.shopify.com/s/files/1/0430/1740/4573/files/laxepa.pdf
    • https://cdn.shopify.com/s/files/1/0433/8368/5270/files/62959103958.pdf
    • https://cdn.shopify.com/s/files/1/0430/8529/9874/files/ias_mathematics_notes_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006500.bin
2cee165082837faa499fe0bfa048cf90514d49a70eee8219417604405df9a5fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6500 5172 bytes
font_01_sfnt_off000076b5.bin
194d4cea4131ed9c7b45aeccbcc233bb1c012ee1753910ea5e33349115152b2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x76B5 12304 bytes
font_02_sfnt_off00009d65.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D65 4324 bytes