Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc932d364f5b0ff5…

MALICIOUS

PDF

48.7 KB Created: 2020-10-08 21:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 21ddc4e33ea92598aae13b47fa31fd7a SHA-1: 7b0fb50316df1c4b3c4db82ea465599676b25e0f SHA-256: fc932d364f5b0ff51d85bdc61858bc23b813f47859fcd8e0f9ad339bf1d23e6b
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains references to URLs that are likely intended to trick users into clicking them. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector suggests a phishing or malware distribution attempt.

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://ggtraff.ru/strik?keyword=voltage+regulator+using+zener+diode+pdf In PDF document text
    • http://files.babylakephotography.com/uploads/1/3/0/8/130814040/9558268.pdfIn PDF document text
    • http://files.durhamtamils.org/uploads/1/3/1/1/131163959/xovilujilogez-rasusugoxi-madiza.pdfIn PDF document text
    • http://files.fittoframephotos.com/uploads/1/3/2/6/132681670/185494.pdfIn PDF document text
    • http://files.fathersweek.com/uploads/1/3/0/7/130739758/2486198.pdfIn PDF document text
    • http://files.medinacountytreasurernews.com/uploads/1/3/0/8/130813855/japupogipafibidimib.pdfIn PDF document text
    • http://files.timothysmithmusic.com/uploads/1/3/0/7/130775834/7314008.pdfIn PDF document text
    • http://gubuje.4toebooth.com/uploads/1/3/0/8/130814416/5fe4b429b.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/e4564b62-3363-4639-9732-588bf4abe1e5/80967414920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f22f5492-0a31-493c-993d-4f04c91bea85/9261699238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/465c3d90-763d-4586-bca2-139409dc1856/66482256800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f087140-f251-4adc-8941-70a278b52c9f/10020955892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d49d12a-ad10-4120-8925-1474060edf12/zaroligeke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1094/8254/files/rant_and_rave_synonym.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6688/4250/files/wow_legion_cooking_guide_1-800.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_off00007d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D5E 5224 bytes
SHA-256: e8536b8a7a52ca0ae06e1ed0f9b5e0eed35b98a73a1000591edad2acd064625f
font_01_sfnt_off00008f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F42 11420 bytes
SHA-256: 658c6e60502d22ccb0b383af9fb19dbd63051ebefd53bdb00c06f675d1f73a44

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