Malicious PDF — malware analysis report

Static analysis result for SHA-256 447bdfd18402d45f…

MALICIOUS

PDF

40.7 KB Created: 2020-08-18 18:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b5d707de5325dfe88c101de7deb9a66 SHA-1: 4d4353bfcd37249b778dc345488987a97211ad38 SHA-256: 447bdfd18402d45ff9367c51796caf20c5aee19a7fdba0ebdac449467a0b43f2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, also contains this URL and references 'customs declaration form us citizens', indicating a phishing lure. The presence of numerous Shopify-hosted PDF links, while mostly benign, suggests a link farm or SEO poisoning tactic to obscure the primary malicious destination. No scripts were extracted, but the primary attack vector is the malicious URL embedded within the document.

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=customs+declaration+form+us+citizens
    • http://files.edmondpiano.co.uk/uploads/1/3/0/7/130775174/ledamopenajuwasoweb.pdf
    • https://cdn.shopify.com/s/files/1/0431/4716/5850/files/85469307152.pdf
    • https://cdn.shopify.com/s/files/1/0435/4323/2661/files/72739331317.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5494/files/41710057193.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xumilegimazuguvabunozanik.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0750/files/nujifuju.pdf
    • https://cdn.shopify.com/s/files/1/0433/4718/1718/files/47050001027.pdf
    • https://cdn.shopify.com/s/files/1/0434/3437/7377/files/641647133.pdf
    • https://cdn.shopify.com/s/files/1/0430/3906/4225/files/sasofipuf.pdf
    • https://cdn.shopify.com/s/files/1/0440/8072/6168/files/30579667094.pdf
    • https://cdn.shopify.com/s/files/1/0434/9408/0677/files/5117439907.pdf
    • https://cdn.shopify.com/s/files/1/0430/5669/3397/files/43765806942.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97454987384.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_off00006141.bin
36d2639181bab0e5b01b0b80903e5a89990c66086cf07f45efa3b67236d14210
pdf-font-stream PDF embedded font (sfnt) at offset 0x6141 5124 bytes
font_01_sfnt_off0000729a.bin
11dff4d27370f0eef55f06307509262021dfc2285d2c7d47bf6ecdadbe62e312
pdf-font-stream PDF embedded font (sfnt) at offset 0x729A 10392 bytes