Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8de9c8b7bf5d26…

MALICIOUS

PDF

53.2 KB Created: 2020-04-15 21:40:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0d28cfbc324907a970a0ee86a9458690 SHA-1: 27b9dd11fc893c2291fb6aa3cf9eaf52aeac0d18 SHA-256: 2d8de9c8b7bf5d268ee155a0576c3d8bc14fc92581d6a08095b608b5a48902df
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on unrelated domains and use numeric or generic slugs, indicative of a link farm or SEO spam tactic. The document body, though heavily obfuscated, contains a string that appears to be a lure related to 'Icloud photo won' t to pc', directing users to a suspicious URL. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://247waterfire.com/uploads/1/3/0/6/130639709/130639709.html#icloud+photo+won%27+t++to+pc
    • http://chriscuisine.com/uploads/1/3/1/4/131453034/3747986.pdf
    • http://randyolivier.com/uploads/1/3/0/7/130739173/jatajun.pdf
    • http://stevenorosspc.com/uploads/1/3/0/7/130738506/a327a22d3b09.pdf
    • http://lizspecht.com/uploads/1/3/0/2/130289475/vetebajirofeva.pdf
    • http://stepuptomike.com/uploads/1/3/0/6/130640097/jesuxu.pdf
    • http://insuranceflatform.com/uploads/1/3/1/3/131381717/9af8027dcb.pdf
    • http://inmemoryofbas.com/uploads/1/3/0/2/130289045/sopimifedaki.pdf
    • http://stepuptomike.com/uploads/1
    • 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_off00009d0d.bin
cf5c745fc68481ffaf57d8809e63d9e44f44aabae879b60a0273555c487d8e86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D0D 9396 bytes
font_01_sfnt_off0000be16.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE16 2652 bytes

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