Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1314d72f2eb4ecf…

MALICIOUS

PDF

39.6 KB Created: 2020-08-17 09:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d59621d8ded1c96b4f4869c5b5181c6b SHA-1: 763ab89832fc9c4e0e07addff406e344511f9083 SHA-256: b1314d72f2eb4ecf39c47ba4e1b19b4c4c3a4e9c21a47f8b7ac6e13674e70f30
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the redirector's target. The presence of a large number of external PDF links, many hosted on cdn.shopify.com, suggests a link farm or SEO poisoning attempt. The ML classifier 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=runescape+bounty+hunter+guide
    • http://files.mobile-mower-fix.co.uk/uploads/1/3/2/6/132695543/zigovel-difim.pdf
    • https://cdn.shopify.com/s/files/1/0436/5297/2697/files/93789610288.pdf
    • https://cdn.shopify.com/s/files/1/0441/0382/7608/files/pujukiperibagixukubokor.pdf
    • https://cdn.shopify.com/s/files/1/0431/2553/8970/files/93253034261.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4033/files/93741334897.pdf
    • https://cdn.shopify.com/s/files/1/0430/6577/0135/files/karututorowidik.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2332/files/learn_python_basics.pdf
    • https://cdn.shopify.com/s/files/1/0429/8617/6675/files/21349982982.pdf
    • https://cdn.shopify.com/s/files/1/0430/8061/4041/files/pagulapaporajepaged.pdf
    • https://cdn.shopify.com/s/files/1/0432/2073/0011/files/jirovuwegugugo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9898/7941/files/kufobofigijaberaveroduvo.pdf
    • https://cdn.shopify.com/s/files/1/0436/0175/6323/files/16480264858.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_off00005c1a.bin
80efb594d36fbbd49e34385725b7c88768a0551885a7d023a1fe71c3b90b4021		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C1A 5552 bytes
font_01_sfnt_off00006ef4.bin
7b4d59d6bfaeb365603cff0fd9aa25bf7d769e23d1ab3bbedb55ddf88b7656ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF4 10216 bytes

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