Malicious PDF — malware analysis report

Static analysis result for SHA-256 748ab584593bfab7…

MALICIOUS

PDF

43.4 KB Created: 2020-10-16 02:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: aa850f57defe8a61bbbed703073e3d6e SHA-1: e3df410c11f3dd80f9fa2be4b55a9f1f02e527dd SHA-256: 748ab584593bfab7abbef6a7a7a36c569e2462fe7cef86dff2812cdc70d57586
124 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure for a technical manual. The ML classifier strongly indicated maliciousness, and the link farm heuristic suggests a pattern of using disposable hosting for malicious redirection.

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/123?keyword=colonial+marines+technical+manual In PDF document text
    • https://site-1039727.mozfiles.com/files/1039727/zukaf.pdfIn PDF document text
    • https://site-1043037.mozfiles.com/files/1043037/roralexajejesafamadipixo.pdfIn PDF document text
    • https://site-1039307.mozfiles.com/files/1039307/basaxiwasajumif.pdfIn PDF document text
    • https://site-1039297.mozfiles.com/files/1039297/bokus.pdfIn PDF document text
    • https://site-1039320.mozfiles.com/files/1039320/12304763672.pdfIn PDF document text
    • https://site-1040892.mozfiles.com/files/1040892/batejowatusokovewodotuje.pdfIn PDF document text
    • https://site-1040094.mozfiles.com/files/1040094/60325331847.pdfIn PDF document text
    • https://site-1039645.mozfiles.com/files/1039645/xefumorepudew.pdfIn PDF document text
    • https://site-1043885.mozfiles.com/files/1043885/23791509658.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_5f880e4fadcae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5f870daf536ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368487/normal_5f87be55b3c97.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/14a24e8e-0194-44e3-9492-80fc39162678/1506519817.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/341a54c0-7e46-4144-8bd3-ac1efa74e853/98157862016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5d58482-2db8-4452-9339-ac316f3b4943/daxojew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e99ab61-6803-4035-a844-2b917eb931a0/pinuguvovimixufirim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88193858-06fd-4c4a-b217-f159f6ea2197/12742995731.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/431bc030-58e6-43ef-85ca-1b1b6738294b/duvunuvorarajemonelat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca3b00b3-e5f3-4206-a6af-90075bdc58dc/78026865265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f929f8a5-731a-40b3-997b-ae5099fcb4ad/20922617398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd856e1e-341f-43d6-93ab-f98d5735a399/60287661680.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_off00006d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D4B 4944 bytes
SHA-256: 41b0225111e36546c22878b8e1400270d4753526256fab9b990331641bb0b3b5
font_01_sfnt_off00007de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE5 9960 bytes
SHA-256: eec23a3af537bfc8a5f295b63ec92de832a8d1ac3a1bee31e195ce080020b1a9

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