Malicious PDF — malware analysis report

Static analysis result for SHA-256 88eb6d95ba2e5c02…

MALICIOUS

PDF

38.3 KB Created: 2020-08-15 23:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc2ce17f8f43c111233cbd90c837a6e3 SHA-1: cffe00eb20928bebea73ed053aee0a71f0d5f58e SHA-256: 88eb6d95ba2e5c02f3b3dbe1cb7909b0d605ebc15e602f4cd25a3874a9d8eb69
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL that leads to the malicious redirector. This suggests the primary goal is to lure the user to a compromised site, likely for further exploitation or credential harvesting. The presence of a large number of external links, many hosted on Shopify, indicates a potential link farm or SEO poisoning tactic to distribute the malicious PDF.

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/wb?keyword=reorder%20level%20formula%20pdf
    • http://files.rammothdm.org/uploads/1/3/1/4/131438583/vupuxitebewij.pdf
    • https://cdn.shopify.com/s/files/1/0432/0424/7715/files/33905404867.pdf
    • https://cdn.shopify.com/s/files/1/0437/2099/9064/files/posonuxefiwe.pdf
    • https://cdn.shopify.com/s/files/1/0429/9125/5713/files/sabosifunumibawawar.pdf
    • https://cdn.shopify.com/s/files/1/0437/0202/6393/files/87287958585.pdf
    • https://cdn.shopify.com/s/files/1/0434/7451/8180/files/duvaratulimajolobe.pdf
    • https://cdn.shopify.com/s/files/1/0429/2037/8524/files/internet_cafe_business_plan_template_doc.pdf
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/64439401193.pdf
    • https://cdn.shopify.com/s/files/1/0435/7790/1214/files/76142887381.pdf
    • https://cdn.shopify.com/s/files/1/0433/7998/2492/files/46088811485.pdf
    • https://cdn.shopify.com/s/files/1/0434/2222/0439/files/venkatrama_telugu_calendar_2015.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_off000058e3.bin
dbf2d1f03cf038652a0a8a4b9600cc9f3d8811b2635836eb163404990b7a2f36
pdf-font-stream PDF embedded font (sfnt) at offset 0x58E3 5076 bytes
font_01_sfnt_off00006a1d.bin
d77664956d80f76791ce811c315cf1db65549663c319fb8d28b236a6f8667d2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A1D 10108 bytes