Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca9bb71502b7a5a…

MALICIOUS

PDF

46.4 KB Created: 2020-04-01 22:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c40c389645062bc9bc3bc353568b552b SHA-1: 1ce7ff0347a07ea45d521bc6deb62ca815f4330d SHA-256: 8ca9bb71502b7a5a5299b95d5d079f0d3a30813923a1e3add58dbaf3bd3d3b21
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of external links, identified as a 'PDF SEO LINK FARM' heuristic. The document body, though partially obfuscated, contains the text 'How to use rpa extractor' and references to 'wkhtmltopdf', suggesting a lure related to automation tools. The primary intent appears to be directing users to a network of linked PDF documents hosted on various domains, likely for SEO manipulation or to serve as a distribution point for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://blacktreelofts.com/uploads/1/3/1/4/131453853/131453853.html#how+to+use+rpa+extractor
    • http://deannorrie.biz/uploads/1/3/0/5/130543279/5100219.pdf
    • http://assist-vie.com/uploads/1/3/0/7/130775092/762062.pdf
    • http://walktopia.net/uploads/1/3/1/4/131406826/bef3b1d.pdf
    • http://yubeautylounge.com/uploads/1/3/0/7/130775922/rezujizufinuwor.pdf
    • http://jenniferanngordon.com/uploads/1/3/0/5/130589415/7033887.pdf
    • http://parkinharrisburg.com/uploads/1/3/0/5/130539108/bixiposuxok-vitozimof.pdf
    • http://onewelfare.net/uploads/1/3/0/7/130775990/6777417.pdf
    • http://pursuitofpassionevent.com/uploads/1/3/0/2/130289198/wokivik.pdf
    • http://yourchairmansclub.us/uploads/1/3/0/5/130590019/8964901.pdf
    • http://doseofhaute.com/uploads/1/3/0/4/130488754/dizok.pdf
    • http://littleslimeshop.com/uploads/1/3/0/7/130775231/kenenikenexub.pdf
    • http://yovell.com/uploads/1/3/1/0/131070992/fajevoludibifap-benepodi-jaledubepigezi.pdf
    • http://finnfithealthfitness.net/uploads/1/3/0/2/130289386/6684891.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_off000076b6.bin
f9fd6e7bf262984354412bc64abbaf34df9d3ad4d8583ca1be7d2af351be5212		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76B6 8288 bytes
font_01_sfnt_off0000969a.bin
322701f1f7ce52f1e2c270a0bb3090cbbccd2613e2548c816e08e746c3346379		 pdf-font-stream PDF embedded font (sfnt) at offset 0x969A 16344 bytes

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