Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe51b3f3b5b837a…

MALICIOUS

PDF

38.5 KB Created: 2020-08-16 18:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb4c3314d64f731c2910a163bd348d3e SHA-1: 9e08d5ea010eddc24c268ce16b7372f30e3149ca SHA-256: 1fe51b3f3b5b837a0457902dabf3148aee94a2024388ce1f8b32f5745ce40402
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.com'. The document body, though heavily obfuscated, contains text related to financial statements and the malicious URL. The presence of numerous embedded URLs, many pointing to Shopify, suggests an attempt to create a link farm for SEO poisoning or to host further malicious content. 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.com/pify?keyword=unappropriated+retained+earnings+balance+sheet
    • http://files.beyondshipsart.com/uploads/1/3/1/4/131453919/ludedaxibuduramu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6674/4220/files/72996594786.pdf
    • https://cdn.shopify.com/s/files/1/0435/4254/4533/files/ganejuronuwonewafatasata.pdf
    • https://cdn.shopify.com/s/files/1/0433/9063/2092/files/aircraft_structure_faa.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/31963407542.pdf
    • https://cdn.shopify.com/s/files/1/0431/0342/0570/files/76299251603.pdf
    • https://cdn.shopify.com/s/files/1/0433/6268/0984/files/61100150481.pdf
    • https://cdn.shopify.com/s/files/1/0440/7253/4166/files/anexar_no_sei.pdf
    • https://cdn.shopify.com/s/files/1/0429/1254/6975/files/acceptable_use_policy_army_form.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7721/files/36069987725.pdf
    • https://cdn.shopify.com/s/files/1/0438/3142/7234/files/lejugesamiranelujoden.pdf
    • https://cdn.shopify.com/s/files/1/0432/3367/3380/files/dolujinuvajutowigul.pdf
    • https://cdn.shopify.com/s/files/1/0429/7788/6367/files/31516282213.pdf
    • https://cdn.shopify.com/s/files/1/0431/5083/5878/files/alkaline_diet.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_off0000584b.bin
a7d6ff13c0286c91e06373e313ea64bf8c2488caef3e1493e9fafd9eda1656cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x584B 5468 bytes
font_01_sfnt_off00006acd.bin
122364705402600ac3be50454d143ec6e8878e2a57b9c48400c337da6a015663
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ACD 10068 bytes