Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bd488768a1ee77…

MALICIOUS

PDF

45.2 KB Created: 2020-08-14 18:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f892aa95e17e05b235bf712933993c4d SHA-1: c8b6e078209ac3e14c2b6ed63e07a0b5a8566d86 SHA-256: 55bd488768a1ee772f840325a3fc299210b2c6be6e2fbd14552d920a0ff2a083
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text fragments and URLs that suggest a lure related to 'sms hospital doctor list'. The presence of many links to Shopify-hosted PDFs, some benign and some unknown, indicates a link farm strategy. The primary malicious URL is https://ttraff.ru/wb?keyword=sms%20hospital%20doctor%20list%202017%20pdf, which is likely used to redirect users to a phishing or scam page.

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/wb?keyword=sms%20hospital%20doctor%20list%202017%20pdf
    • http://dabefax.saylorflett.com/uploads/1/3/1/4/131454859/1814892.pdf
    • http://files.faithisfamily.org/uploads/1/3/0/8/130874652/581bfd6b4e00c8.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0724/files/nupisuz.pdf
    • https://cdn.shopify.com/s/files/1/0437/5419/3047/files/50491881655.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekosipavejidowusa.pdf
    • https://cdn.shopify.com/s/files/1/0447/3287/4901/files/on_the_historicity_of_jesus_richard_carrier_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/kovatebepopufa.pdf
    • https://cdn.shopify.com/s/files/1/0440/2610/1925/files/donation_receipt_template_canada.pdf
    • https://cdn.shopify.com/s/files/1/0433/8571/6886/files/divikisomeg.pdf
    • https://cdn.shopify.com/s/files/1/0438/1592/7965/files/77418808733.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9354/files/bienestar_animal_5_libertades.pdf
    • https://cdn.shopify.com/s/files/1/0446/8106/8697/files/formaldehyde_37_technical_data_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0448/3593/0273/files/asian_cup_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/0848/2724/files/dieta_antroposofica.pdf
    • https://cdn.shopify.com/s/files/1/0428/1958/4166/files/galegawevixakotitagapibof.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_off00006423.bin
4785f0e3712e7f350138af888ddbb1207680daa976dba83bcfea204c8b78509a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6423 5904 bytes
font_01_sfnt_off00007812.bin
e45f29aed35cb7925217e706b9125ceeff266f1438e87ccdc1625d48f404bdaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7812 15416 bytes

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