Malicious PDF — malware analysis report

Static analysis result for SHA-256 0523ed54882332bb…

MALICIOUS

PDF

45.6 KB Created: 2020-10-17 10:39:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 34bca09559477a980033e197dfb8dbe6 SHA-1: 55e54d257b211fa28c18e06ea984d4d006388fc1 SHA-256: 0523ed54882332bbf4bb9183733b16e2bf19dba272b0bdd3b9bb3c8f4abb20e8
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting and appear to be part of an SEO link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'ggtraff.ru'. The ML classifier strongly indicated maliciousness, suggesting the primary purpose is to manipulate search engine rankings or redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?keyword=sleep+paralysis+spirit+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379602/normal_5f8a656c8a620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370780/normal_5f8989e863a5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366375/normal_5f872b4f9c79b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366666/normal_5f8a624fadcb4.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/jatelu-zukolugaw.pdfIn PDF document text
    • https://dapujevubo.weebly.com/uploads/1/3/1/4/131438680/4abdc26250fc54.pdfIn PDF document text
    • https://genamimiwovem.weebly.com/uploads/1/3/1/6/131636881/7111633.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/81e29b51b843.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/3409757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369305/normal_5f88d52a60191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368265/normal_5f8a10be370ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374954/normal_5f8a3ead10775.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6164ecd3-00f7-4cf3-8af8-6cd6a750a129/best_games_on_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c3d7b59-c338-4434-bd2c-5c90428d5c4e/bticino_terraneo_5_fils.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45044e76-836d-4e7c-85d3-d57ae568058a/52785287250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43de9800-7008-40de-a3e8-f28148bad518/gujubukubuzapisotuxiru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79dfa8e6-4fd1-43f4-869b-acbc98ee6b1b/zumupujagedaxadununil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0524/6112/files/neruwirekumobid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8059/0521/files/majisobukolot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9636/2148/files/29850415986.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2738/4488/files/ravelli_monica_pellet_stove_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/9617/2453/files/71678558733.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/1803/0751/files/tidolomudakunet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8622/4801/files/writing_formulas_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8107/0747/files/47996980643.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7320 5332 bytes
SHA-256: 2c40731dcdbea47bebccd76a6d9e35c21b10b706cf5e94b047d2013d3092daff
font_01_sfnt_off00008552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8552 10244 bytes
SHA-256: 6486a8bddb1195ff2cd3e1245493267a78c27439bc53bdb66e36c777b733bced

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