Malicious PDF — malware analysis report

Static analysis result for SHA-256 81404f844c2c3165…

MALICIOUS

PDF

53.5 KB Created: 2020-08-16 12:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8263762be4ee8f9fb6ff3396ae52ac4 SHA-1: a28b67c77815ebbdeab0b538e91c19c8dd973bf2 SHA-256: 81404f844c2c3165842a91895218a6c5e6e245f85b632890b004b8bb4dea2c03
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 a known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'Batman movie tamil'. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or content-spinning operation designed to obscure the malicious redirector.

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=batman+movie+tamil
    • http://taxeme.stbernadetteofantioch.org/uploads/1/3/1/4/131482995/2968149.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/39554019041.pdf
    • https://cdn.shopify.com/s/files/1/0431/2950/3901/files/qaseeda_burda_shareef_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8933/0330/files/vapuvixokuwemidejajos.pdf
    • https://cdn.shopify.com/s/files/1/0438/0826/0258/files/66648263244.pdf
    • https://cdn.shopify.com/s/files/1/0436/4815/5806/files/tibus.pdf
    • https://cdn.shopify.com/s/files/1/0435/6741/5457/files/82344000730.pdf
    • https://cdn.shopify.com/s/files/1/0430/3002/0247/files/raxotesikoxidumujirepates.pdf
    • https://cdn.shopify.com/s/files/1/0434/7317/4693/files/43373521470.pdf
    • https://cdn.shopify.com/s/files/1/0433/1149/7366/files/9654700764.pdf
    • https://cdn.shopify.com/s/files/1/0430/9932/4567/files/94966153362.pdf
    • https://cdn.shopify.com/s/files/1/0431/1567/5809/files/tugevutekolenabusu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1542/files/latijidujefosoniv.pdf
    • https://cdn.shopify.com/s/files/1/0434/8405/3669/files/9518927934.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_off00009611.bin
4df18d86ba74e0e6155442df82a3d4d0f8ff47298272433374e4a3227f534501
pdf-font-stream PDF embedded font (sfnt) at offset 0x9611 4668 bytes
font_01_sfnt_off0000a5e4.bin
be67ebb91fa5f2360415b8ee1540dda98a4b1e2ed47920e23b2bb03b8fb4ed24
pdf-font-stream PDF embedded font (sfnt) at offset 0xA5E4 10364 bytes