Malicious PDF — malware analysis report

Static analysis result for SHA-256 329c20d82766cd00…

MALICIOUS

PDF

48.7 KB Created: 2020-08-02 23:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e699370d46080cf92205eb21486c816 SHA-1: 1320323d21392d7295c75473664fd54abf48c269 SHA-256: 329c20d82766cd003b1a96e7a9377fcad952e3576326b3682ceee2b3462aaa0e
152 Risk Score

Malware Insights

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

This PDF document is classified as malicious due to its structure, which includes a large number of embedded links. One critical heuristic identified a link to a known malicious redirector, while another flagged it as a PDF link farm. The document body contains obfuscated text and a URL that appears to be part of the malicious redirection chain. The primary attack pattern involves luring users to malicious sites through a deceptive link farm.

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=lag+spikes+league+of+legends
    • http://files.clantonmartialarts.com/uploads/1/3/1/8/131856446/90836a.pdf
    • http://files.artofmwniemann.com/uploads/1/3/0/8/130813694/49354dc0b26.pdf
    • http://files.drsunnyimwang.com/uploads/1/3/0/7/130776081/lipimose-wituninifix.pdf
    • http://files.longevitywines.com/uploads/1/3/1/4/131455158/19fad89befa.pdf
    • http://files.busybeeorganize.ca/uploads/1/3/0/9/130969004/gojebifazalomo-maxurapokenoxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/boruxunijutaki.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/rupeguwegatofupefemuviz.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/12863952362.pdf
    • https://cdn.shopify.com/s/files/1/0428/7873/0403/files/troy_bilt_wood_chipper.pdf
    • https://cdn.shopify.com/s/files/1/0428/4245/6231/files/41139865690.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6918/files/dijakedifurudamomefogoraz.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8555/files/65464904661.pdf
    • https://cdn.shopify.com/s/files/1/0432/0342/8510/files/xatoduvegezeka.pdf
    • https://cdn.shopify.com/s/files/1/0430/4565/0586/files/12517453388.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/10851344088.pdf
    • https://cdn.shopify.com/s/files/1/0429/7008/7587/files/wamubudotimimojalavib.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000080d4.bin
2b27b8bff68a9434745781f0291c19ede27fff4a5e53786283654231ff901e63
pdf-font-stream PDF embedded font (sfnt) at offset 0x80D4 5120 bytes
font_01_sfnt_off00009267.bin
504f298b6b0439d3050acc1924ba1b6a2281c5b9448df32e8e455219e50d2840
pdf-font-stream PDF embedded font (sfnt) at offset 0x9267 10360 bytes