Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e3f7aba4c2b0ce…

MALICIOUS

PDF

44.8 KB Created: 2020-11-09 11:02:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 393927b5bd95e3eff135a4421af41992 SHA-1: e6fb373fe8e5c15649b90ad1576caf460f733249 SHA-256: c6e3f7aba4c2b0ce3246e138d762f09128f34df56edcca17c47df7ef100ba37c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a lure related to account generation for popular games, directing users to a suspicious URL. It also functions as a link farm, hosting numerous external PDF files, many of which are hosted on disposable domains. The ML classifier strongly indicates maliciousness, and the overall structure suggests an attempt to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffset.ru/123?keyword=account+generator+fortnite+xbox PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369760/normal_5f8c54250dbe7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387821/normal_5f9741652ee67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385869/normal_5f8e4d1d7f30f.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/jekowis_fuvonobux.pdfIn PDF document text
    • https://jufopikigon.weebly.com/uploads/1/3/4/3/134309667/vibafemej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zuxadol/nusebinikisu.pdfIn PDF document text
    • https://gosezojez.files.wordpress.com/2020/11/tinad.pdfIn PDF document text
    • https://jirovef.files.wordpress.com/2020/11/34885317841.pdfIn PDF document text
    • https://finikonave.files.wordpress.com/2020/11/nukutuvigatexaxapajer.pdfIn PDF document text
    • https://xasavibe.files.wordpress.com/2020/11/37254951641.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6432 4920 bytes
SHA-256: 5ce16c9d473a6055aac9474e04f3cb4134c6738475a11b73cba4a22fb9b5836a
font_01_sfnt_off00007501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7501 10304 bytes
SHA-256: b843f9da2103d4d8e6801a9adff7b81eab8c1680333c154bc5878f1c2fe1bb1a
font_02_sfnt_off0000985b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x985B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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