Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e3d3762e2b2b72e…

MALICIOUS

PDF

34.9 KB Created: 2020-08-19 03:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c29ca78b3dcd9032a50d9c934fc5b5cd SHA-1: 47a9dd651d3f47798e5c38a1fe8ffb3c3c1b3755 SHA-256: 6e3d3762e2b2b72ec2c831984fbba3ed5d244f5886f5190bebcc4e4d81b80813
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting an attempt to manipulate search engine results or direct users to malicious sites. 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=disney+lullabies+piano+sheet+music
    • http://files.gilliantorckler.com/uploads/1/3/0/8/130874629/gomenevidi-kinepowa-xasokipa-xupuzateseroji.pdf
    • http://files.magicappleschool.net/uploads/1/3/0/7/130776639/jinomoniteja_ketelagupevuf_jiguroweda_zejuw.pdf
    • http://files.laurawilsonlifecoaching.com/uploads/1/3/0/8/130874610/8617851.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8280/8472/files/tuxeka.pdf
    • https://cdn.shopify.com/s/files/1/0435/3317/2885/files/tupejimulixelukilukax.pdf
    • https://cdn.shopify.com/s/files/1/0439/1459/2408/files/namawafuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/8909/1998/files/full_body_massage_therapy.pdf
    • https://cdn.shopify.com/s/files/1/0430/0836/0611/files/personal_computer_system.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/nakigulodopovurefexumakug.pdf
    • https://cdn.shopify.com/s/files/1/0432/7152/0409/files/23503038261.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/fenanemewi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7753/2824/files/nhs_choices_back_exercises.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_off00004c92.bin
103b0ca553770d4b8a4567763063b92cf6b7f871d0e1faa9d070c1b1f1eeb314
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C92 5316 bytes
font_01_sfnt_off00005e82.bin
57c0da07fd69ebc71a3b80469400e10437f68c002dc545621de1edf9d8e1dab1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E82 9444 bytes