Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7468c25df6e747…

MALICIOUS

PDF

51.8 KB Created: 2020-11-08 13:37:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb0781ab39e1d899c3c456cdd16fa8cd SHA-1: 131bb34e2a35e0d9760f798d722c65440a975191 SHA-256: 0f7468c25df6e7471c153782506829f106cff8a6400f18aaa453356b6e2b79cd
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, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files. One of the primary URLs is 'https://traffnew.ru/aws?keyword=yosuke+social+link+guide', which appears to be a lure for SEO manipulation or to host malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the structure suggests a malicious document intended to redirect users to potentially harmful 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 https://traffnew.ru/aws?keyword=yosuke+social+link+guide
    • https://cdn-cms.f-static.net/uploads/4371010/normal_5f8c9d0d815b6.pdf
    • https://cdn-cms.f-static.net/uploads/4386834/normal_5fa34d7b729e1.pdf
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5f8a110da3e97.pdf
    • https://cdn-cms.f-static.net/uploads/4393890/normal_5f96dce3eeb21.pdf
    • https://cdn-cms.f-static.net/uploads/4379362/normal_5f8ef81b531d9.pdf
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5f8707b990cbc.pdf
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5f909b8731221.pdf
    • https://vuwugaletop.weebly.com/uploads/1/3/4/5/134588193/59654.pdf
    • https://cdn-cms.f-static.net/uploads/4390643/normal_5f9e01683abd7.pdf
    • https://cdn-cms.f-static.net/uploads/4366401/normal_5f8a69605e700.pdf
    • https://cdn-cms.f-static.net/uploads/4384820/normal_5f9a761bc9ec6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0c3fc117-1a8a-46e0-ab7c-d59937da0c14/53185444644.pdf
    • https://uploads.strikinglycdn.com/files/e362fb47-15b2-4da1-acbf-f90c87ce2201/tomabofomubide.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075ba.bin
5d7ae23d926afcfe84cf436daff9cb0ac5ec62d08fe4407f98be9065a9319f11
pdf-font-stream PDF embedded font (sfnt) at offset 0x75BA 5036 bytes
font_01_sfnt_off000086f6.bin
73d704ee8be94c6cea3649e210eac1936bd849efbbe7e3019f7c7aa774dbbf50
pdf-font-stream PDF embedded font (sfnt) at offset 0x86F6 10900 bytes
font_02_sfnt_off0000ac7f.bin
d6354e55a0ef37be0a61ea5c81a5777e0d3d2e8edb3ff3de3a4eaf5ff52a9aaf
pdf-font-stream PDF embedded font (sfnt) at offset 0xAC7F 16348 bytes