Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9685aa426ba2ed…

MALICIOUS

PDF

75.5 KB Created: 2020-12-29 12:50:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ed68d6b85e6f34dffb97bbd7985367d7 SHA-1: bb126b6383995996e48256499ed0097ff5a28cb1 SHA-256: ca9685aa426ba2edebf9078cd4fe564f16fd8363e30a46d935b505adfaa87881
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files. One of the primary external links, https://trafficel.ru/strik?utm_term=anti+stress+ball+best+price, suggests a lure to a commercial product, likely a deceptive tactic. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://trafficel.ru/strik?utm_term=anti+stress+ball+best+price PDF link annotation
    • https://vobemebu.weebly.com/uploads/1/3/4/3/134383317/kurikezojuj_jufipazubibu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5f99355c21bcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421957/normal_5f9fd4ec2e112.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419441/normal_5f97c7c86e998.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409627/normal_5fd3417841612.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bupijila/gta_vice_city_all_cheat_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/toriwovaletasilifo.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/tumuxitararotomosaf.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/dilaxu.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/duvaxeverupire.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/gisorafukalibupoje.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD741 5056 bytes
SHA-256: 883f9f9655d5ca5b809cf442c25a4d41c70f7eab0e43843ba51405363cc23e19
font_01_sfnt_off0000e87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87A 10420 bytes
SHA-256: 6b3f74e813ea1153afaa420c50563b780481e9041a16f17d4a703b1899dde10a
font_02_sfnt_off00010c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2A 16164 bytes
SHA-256: ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1