Malicious PDF — malware analysis report

Static analysis result for SHA-256 601571fc78f4a733…

MALICIOUS

PDF

41.5 KB Created: 2020-08-27 18:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b3dac4ffe7c4cb3e2a737960396b231 SHA-1: 5d004a5d7d19708f6914381a4f778b6251c83bcc SHA-256: 601571fc78f4a73325f51ced435cf0100832f601dc27f33118f78e7b651d570a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or SEO spam campaign, aiming to drive traffic to malicious sites.

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=examples+of+allegories
    • http://files.foodwebfarms.com/uploads/1/3/0/9/130969061/6883247.pdf
    • http://files.emathacademy.com/uploads/1/3/0/9/130970003/wisefalikov.pdf
    • http://fujadozu.vanessamariedewsbury.com/uploads/1/3/0/8/130874493/4463587.pdf
    • http://files.yunomipotterystudio.com/uploads/1/3/2/7/132740978/korakalovoxir-gixof-nemeret-gajonudaludom.pdf
    • http://files.katherinelmcneill.com/uploads/1/3/1/4/131453650/8609043.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/6788/1125/files/fraction_multiplication_problems_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/2809/3856/files/75259622459.pdf
    • https://cdn.shopify.com/s/files/1/0432/8210/4478/files/lolidinujemogudezusot.pdf
    • https://cdn.shopify.com/s/files/1/0437/4190/5045/files/libro_administracion_de_recursos_humanos_mondy.pdf
    • https://cdn.shopify.com/s/files/1/0435/2072/1055/files/darej.pdf
    • https://cdn.shopify.com/s/files/1/0433/9911/9013/files/36955236682.pdf
    • https://cdn.shopify.com/s/files/1/0438/7205/9547/files/perilasokurefibodubiw.pdf
    • https://cdn.shopify.com/s/files/1/0427/7505/2454/files/mathematical_statistics_with_applications_solutions_wackerly.pdf
    • https://cdn.shopify.com/s/files/1/0432/7247/0686/files/nisubonadorikekesomip.pdf
    • https://cdn.shopify.com/s/files/1/0434/5305/5128/files/sefoserom.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_off000064a2.bin
272fc80d42e44db3e004fc44a1ff0dd7bf1ccd33f4581194495d503dd7f47a7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x64A2 5244 bytes
font_01_sfnt_off00007677.bin
c095ce725bc2934bad67eef14166d76da15fc82ce241b2bd9339f84223feb6cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7677 10380 bytes