Malicious PDF — malware analysis report

Static analysis result for SHA-256 6efc338a81978f13…

MALICIOUS

PDF

34.1 KB Created: 2020-04-06 09:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2a93895eb66a003884ba80e4e34dc70b SHA-1: 748954d4db9b166388eda235747cbfbef2888d16 SHA-256: 6efc338a81978f13d5845abff03e43bf674a4385b861bc93f55cd87741acbcfd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many of which are structured as SEO-like links to other PDF files. The document body text is minimal and appears to be a lure, referencing a search query about Sentry Safe model numbers. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic suggests this is part of a link farm or SEO poisoning campaign designed to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://referral360network.com/uploads/1/3/0/4/130435743/130435743.html#how+do+i+find+my+sentry+safe+model+number
    • http://vi-j.nl/uploads/1/3/1/3/131383673/3690830.pdf
    • http://bodyartanddesign.com/uploads/1/3/0/4/130435795/8199722.pdf
    • http://mountainplayschool.com/uploads/1/3/0/6/130621788/xuziniwavefeje.pdf
    • http://claysmithwrites.com/uploads/1/3/0/2/130289693/d39e8.pdf
    • http://shearerdesigns.net/uploads/1/3/1/4/131455903/9399125.pdf
    • http://makingmusiconenoteatatime.com/uploads/1/3/0/2/130287314/2123389.pdf
    • http://bloemrx.com/uploads/1/3/0/4/130475979/zawitidere-guxorizez.pdf
    • http://dabboutdoor.com/uploads/1/3/0/2/130288864/6790513.pdf
    • http://swedishcashcrew.com/uploads/1/3/1/4/131452750/dozibibafunigi.pdf
    • http://topdollar4junk.com/uploads/1/3/1/1/131164130/fudimefur-vuxeperof.pdf
    • http://curatingarchitecture.com/uploads/1/3/0/7/130740462/d53af9a.pdf
    • http://exclusiveshaes.com/uploads/1/3/0/7/130739893/gukolalen-rapowilirodel-xivaxebuxufuzix.pdf
    • http://newwebtest.com/uploads/1/3/0/3/130313363/1ca17dad.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b8b.bin
0fe9ce7654c94f9e8dfeffab21567a3f7e9fcabe20ea93847aa3712885190160		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B8B 8104 bytes

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