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) First seen: 2020-09-24
MD5: c40c389645062bc9bc3bc353568b552b SHA-1: 1ce7ff0347a07ea45d521bc6deb62ca815f4330d SHA-256: 8ca9bb71502b7a5a5299b95d5d079f0d3a30813923a1e3add58dbaf3bd3d3b21
96 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 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://blacktreelofts.com/uploads/1/3/1/4/131453853/131453853.html#how+to+use+rpa+extractor PDF link annotation
    • http://deannorrie.biz/uploads/1/3/0/5/130543279/5100219.pdfIn PDF document text
    • http://assist-vie.com/uploads/1/3/0/7/130775092/762062.pdfIn PDF document text
    • http://walktopia.net/uploads/1/3/1/4/131406826/bef3b1d.pdfIn PDF document text
    • http://yubeautylounge.com/uploads/1/3/0/7/130775922/rezujizufinuwor.pdfIn PDF document text
    • http://jenniferanngordon.com/uploads/1/3/0/5/130589415/7033887.pdfIn PDF document text
    • http://parkinharrisburg.com/uploads/1/3/0/5/130539108/bixiposuxok-vitozimof.pdfIn PDF document text
    • http://onewelfare.net/uploads/1/3/0/7/130775990/6777417.pdfIn PDF document text
    • http://pursuitofpassionevent.com/uploads/1/3/0/2/130289198/wokivik.pdfIn PDF document text
    • http://yourchairmansclub.us/uploads/1/3/0/5/130590019/8964901.pdfIn PDF document text
    • http://doseofhaute.com/uploads/1/3/0/4/130488754/dizok.pdfIn PDF document text
    • http://littleslimeshop.com/uploads/1/3/0/7/130775231/kenenikenexub.pdfIn PDF document text
    • http://yovell.com/uploads/1/3/1/0/131070992/fajevoludibifap-benepodi-jaledubepigezi.pdfIn PDF document text
    • http://finnfithealthfitness.net/uploads/1/3/0/2/130289386/6684891.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76B6 8288 bytes
SHA-256: f9fd6e7bf262984354412bc64abbaf34df9d3ad4d8583ca1be7d2af351be5212
font_01_sfnt_off0000969a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x969A 16344 bytes
SHA-256: 322701f1f7ce52f1e2c270a0bb3090cbbccd2613e2548c816e08e746c3346379

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