Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca29502ad18cffe…

MALICIOUS

PDF

42.9 KB Created: 2020-04-12 02:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e8bd328fab8dd7dcd46dd27be0afe342 SHA-1: f90a6e7c4fc6c43af326fa69967e04ecdb0b324b SHA-256: 1ca29502ad18cffebb659503f62629fb08b10e2e3d4f7c7d965bdbddf24341b5
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML classifier also strongly flagged this PDF as malicious. The embedded document body text, though heavily obfuscated, contains a URL that mirrors one of the extracted external links, reinforcing the malicious intent of directing users to external resources.

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://greenwolfverticalfarm.com/uploads/1/3/1/6/131606169/131606169.html#word+power+made+easy+by+norman+lewis+app
    • http://rivalhelicopter.com/uploads/1/3/1/6/131606366/desusopope_roverevetokelek.pdf
    • http://fitnessondelivery.com/uploads/1/3/1/3/131398540/58ffef2deb7.pdf
    • http://nirvana-estates.com/uploads/1/3/0/5/130544390/sedapobaliwadabatama.pdf
    • http://masoncrumley.com/uploads/1/3/1/4/131453527/654721.pdf
    • http://permastress.com/uploads/1/3/0/8/130873820/teguwebozizaxut-vagofajater-niboruvodivog-mizujenuneninu.pdf
    • http://durhamrealestatepics.com/uploads/1/3/0/6/130605383/busuduli_fodopele_niluvuvufor_bagusonopabeke.pdf
    • http://giroguides.com/uploads/1/3/0/7/130775135/bobamozusunova.pdf
    • http://emilyisaacswellness.com/uploads/1/3/0/4/130488244/4ed69aed4f3b7.pdf
    • http://jessicalgervaisbooks.com/uploads/1/3/1/3/131398533/javufulanazo_tikixafiga_rokoletarotuku.pdf
    • http://premierhvacservices.com/uploads/1/3/1/1/131163651/274ef1.pdf
    • http://theroyalkings.com/uploads/1/3/0/3/130313111/6368647.pdf
    • http://advisorlawyers.com/uploads/1/3/1/3/131380109/4023685.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_off00007688.bin
5e524438747a4cdd13ff5623340acebe7333de3bb3ccdd94e2c71f22fd9c1c65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7688 7924 bytes
font_01_sfnt_off0000956b.bin
362efc88ee3e386859df28ac84511f1a9117469b97f067cf82e04b47197d905a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x956B 2024 bytes

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