Malicious PDF — malware analysis report

Static analysis result for SHA-256 28fbc0eeb85b4c91…

MALICIOUS

PDF

50.9 KB Created: 2020-08-08 20:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f09c71a59e1019785a4f047d580b0e12 SHA-1: fc2cf0524c615a9d5d54c6f3070f83adaa55528f SHA-256: 28fbc0eeb85b4c9148c6950e0e5f6c7368595caae70172433aed4f997e8de001
152 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a malicious URL, disguised as a tool to export Google Books to PDF. This indicates a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, and heuristic rules confirm the presence of malicious redirector links and a link farm. The document body, though heavily obfuscated, contains the target URL.

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=export+google+books+to+pdf
    • http://files.msgreenoughsvirtualguidanceoffice.ca/uploads/1/3/1/8/131857421/9358062.pdf
    • http://files.firecrackersgibson.com/uploads/1/3/1/8/131856285/1491571.pdf
    • http://files.beerliquordelivery.ca/uploads/1/3/2/7/132741064/2185065.pdf
    • http://files.msgreenoughsvirtualguidanceoffice.c
    • https://cdn.shopify.com/s/files/1/0436/7086/4037/files/18390000519.pdf
    • https://cdn.shopify.com/s/files/1/0430/0298/6659/files/9175548034.pdf
    • https://cdn.shopify.com/s/files/1/0430/6042/8962/files/ponuxofu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/jutegalarumudijijetumaje.pdf
    • https://cdn.shopify.com/s/files/1/0429/4872/2851/files/1719408803.pdf
    • https://cdn.shopify.com/s/files/1/0428/7810/7811/files/caisson_disease_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8176/files/1841102581.pdf
    • https://cdn.shopify.com/s/files/1/0432/5117/1478/files/lizajotuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xiwisabimetabif.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c22.bin
f3154aaa8831b6a0856e03725bcebb0d1b4cff89cd1576d2e0e30698d4fc6000
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C22 4864 bytes
font_01_sfnt_off00008cc9.bin
4b3b99271a07a11eb4e4b98341bbfcc98aa0ec00256ae13e691e697926a6e8a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC9 10500 bytes
font_02_sfnt_off0000b0ac.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AC 4324 bytes