Malicious PDF — malware analysis report

Static analysis result for SHA-256 72dc6cf1fe53b740…

MALICIOUS

PDF

45.9 KB Created: 2020-08-01 19:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f41d7654324931e44c5e4cb9cf68aa98 SHA-1: 208528d2e36ed5678869f66491c59af1c1e4f927 SHA-256: 72dc6cf1fe53b74088ae33129fb5a031a19a5c8105f73b8621c0bd9347eab225
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify-hosted PDFs, which is indicative of a link farm designed for SEO manipulation. One of the primary links, 'https://ttraff.ru/pify?keyword=lg+universal+remote+codes', is flagged as a malicious redirector, suggesting the document's purpose is to lead users to malicious infrastructure. 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=lg+universal+remote+codes
    • http://files.nursingconcepts.org/uploads/1/3/1/4/131452883/c4982f9424aa.pdf
    • http://files.doggiestylezinc.com/uploads/1/3/1/3/131384663/6210112.pdf
    • http://files.centrallyesl.com/uploads/1/3/2/8/132815866/8376184.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jazaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/4815/7859/files/hp_dv9000_parts_diagram_keyboard.pdf
    • https://cdn.shopify.com/s/files/1/0428/4012/9692/files/puwujirefofazugitexu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9975/8497/files/34939746718.pdf
    • https://cdn.shopify.com/s/files/1/0430/3273/9989/files/47385284198.pdf
    • https://cdn.shopify.com/s/files/1/0430/9906/2426/files/bakezuwurutixaluk.pdf
    • https://cdn.shopify.com/s/files/1/0434/3427/9062/files/vodizonutunijefuboraferiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/9338/3585/files/58210972413.pdf
    • https://cdn.shopify.com/s/files/1/0428/7732/1379/files/enderman_farm_overworld.pdf
    • https://cdn.shopify.com/s/files/1/0430/6137/9226/files/fitenorozixivilisefugujav.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2122/files/65181294750.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_off00007544.bin
3c53a30c391d46e34a756717685390ac71ae78e53b725d49ad1fee23f29dba10
pdf-font-stream PDF embedded font (sfnt) at offset 0x7544 5260 bytes
font_01_sfnt_off00008720.bin
4cc0d13f06bf97b0f27cb52af439848af5d7afa82b5acae20ec81fb95a7c489d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8720 10616 bytes