Malicious PDF — malware analysis report

Static analysis result for SHA-256 07705bff24cf2aa6…

MALICIOUS

PDF

39.2 KB Created: 2020-08-21 10:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4c6f3888327fcf871e6cd2c4e9fcefa SHA-1: 1e6929956c998126c9c012dda1b23fc9b69819f5 SHA-256: 07705bff24cf2aa687f1e9092301bef2803655a5fcd7df914103b931899d321c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as sheet music. It also hosts a large number of other PDF files, suggesting a link farm or SEO poisoning attempt to drive traffic to malicious sites. The ML classifier strongly indicates maliciousness, and the overall structure points to a phishing or malware distribution scheme.

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.com/pify?keyword=trumpet+sheet+music+hallelujah+chorus
    • http://jumevoji.gpbballstore.net/uploads/1/3/1/0/131070152/931369.pdf
    • http://files.annettedelcanto.com/uploads/1/3/1/4/131406412/0af1fa5441bb7.pdf
    • https://creativecommo
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8098/2438/files/formulation_of_functional_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0436/1384/7714/files/bakikut.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5226/files/3190644788.pdf
    • https://cdn.shopify.com/s/files/1/0435/3146/8951/files/tubaginuka.pdf
    • https://cdn.shopify.com/s/files/1/0440/1682/8581/files/78256425404.pdf
    • https://cdn.shopify.com/s/files/1/0437/4927/7845/files/massey_algebraic_topology.pdf
    • https://cdn.shopify.com/s/files/1/0431/3546/7682/files/97532832860.pdf
    • https://cdn.shopify.com/s/files/1/0427/9658/1020/files/50883655927.pdf
    • https://cdn.shopify.com/s/files/1/0434/0829/4039/files/89783559145.pdf
    • https://cdn.shopify.com/s/files/1/0435/3874/3450/files/xozosakapitixizugugekedij.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_off00004cf2.bin
7a9f8361cc2f04b4672998c93de0314b6e879426c47f1a75737b9ce7198edcee
pdf-font-stream PDF embedded font (sfnt) at offset 0x4CF2 5196 bytes
font_01_sfnt_off00005e76.bin
3c17629fc395ed0a99c1b72635cc0e1b7e471c5f17961512853cc0807bdfaa3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E76 15160 bytes