Malicious PDF — malware analysis report

Static analysis result for SHA-256 31fb0d588fda0ccd…

MALICIOUS

PDF

43.5 KB Created: 2020-10-01 21:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d2bc426ffb41d061ceef7516fbd604ef SHA-1: 76a1a488f36b5b9a324dde13f56168ee825cb5da SHA-256: 31fb0d588fda0ccdc08a3d7c6bbdfa3d8a68071a1941b14901f8b85ba389cfd9
124 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://cctraff.ru/strik?keyword=idecad+mimari+8.62+crack', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to reference 'idecad mimari 8.62 crack' and includes the malicious URL, suggesting a lure for users seeking cracked software. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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://cctraff.ru/strik?keyword=idecad+mimari+8.62+crack In PDF document text
    • http://files.saraayllon.eu/uploads/1/3/1/3/131380627/vuserebolitis.pdfIn PDF document text
    • http://files.empowercca.com/uploads/1/3/1/1/131164577/tajare.pdfIn PDF document text
    • http://files.jrasales.com/uploads/1/3/0/9/130969790/20a8c23.pdfIn PDF document text
    • http://xapuru.mysuidora.com/uploads/1/3/1/4/131437626/nonumodawizerafos.pdfIn PDF document text
    • https://site-1037141.mozfiles.com/files/1037141/82723271954.pdfIn PDF document text
    • https://site-1036909.mozfiles.com/files/1036909/2250264215.pdfIn PDF document text
    • https://site-1037172.mozfiles.com/files/1037172/wejukow.pdfIn PDF document text
    • https://site-1039283.mozfiles.com/files/1039283/xetunilove.pdfIn PDF document text
    • http://urlin.us/e04zkidecadIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/0056/9253/files/hero_movie_songs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/5009/8584/files/vaxegiviz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3892/4181/files/uc_browser_apk_free_download_for_pc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5079/3110/files/jejisotufolekijujal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4355/2423/files/58356839471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23984581-a608-4f7d-aab2-526046cce65d/sowagazejojotanegesuk.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_off00006908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6908 5388 bytes
SHA-256: ed4c6f6bb82a87ee00b68b0a11550d1b7f7543256f78a668c664aefd377d6d31
font_01_sfnt_off00007b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B4B 11480 bytes
SHA-256: 28f9244b12a62a72d701c60bc786cb9471b40a90d9089671fc522d84cd488647

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