Malicious PDF — malware analysis report

Static analysis result for SHA-256 fadbe48b122fd2ae…

MALICIOUS

PDF

44.1 KB Created: 2020-10-03 22:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d97c7024e83c36612a20ec44dbc1e16c SHA-1: debeb45b1a81b4d3e1ebe70934440deb2a450b20 SHA-256: fadbe48b122fd2ae09f0a18da09d1ef1cd11a1e86663c276bf4ff95eaeeeb827
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=cathode+ray+oscilloscope+working+principle+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain references to technical terms and the URL itself, suggesting a lure to trick users into clicking the malicious link. 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=cathode+ray+oscilloscope+working+principle+pdf In PDF document text
    • http://files.artsalpharetta.org/uploads/1/3/1/4/131453127/66514c94.pdfIn PDF document text
    • http://files.sghirsch.com/uploads/1/3/0/8/130873828/gutikufe.pdfIn PDF document text
    • http://files.ltcoljoycepapers.org/uploads/1/3/0/7/130775565/xevegisosujemav_sujidopizutomuj_dususi_teganazozejute.pdfIn PDF document text
    • http://files.trinityreese.com/uploads/1/3/1/4/131406269/f87ed.pdfIn PDF document text
    • https://site-1036939.mozfiles.com/files/1036939/13816815258.pdfIn PDF document text
    • https://site-1036681.mozfiles.com/files/1036681/baximawodifamasabapok.pdfIn PDF document text
    • https://site-1036851.mozfiles.com/files/1036851/38410770972.pdfIn PDF document text
    • https://site-1039280.mozfiles.com/files/1039280/wekad.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/99d9cd39-c0bd-4553-a018-9965654ad3ba/sexidowadu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aeaf571-b1c3-4b0c-b604-98bf4a0e053c/fituneloletoteziwew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29dc7e9b-3e26-4f3f-8f5a-5f390cf32756/54949300830.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c675f20c-e70f-4e45-ad55-a85028d8096f/vagodupukamegexaxan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8259b41b-6566-4316-9eb3-6b4c0baeacc3/wuzibiwupisososadubik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/453817bf-66d8-4f59-8225-a26a72910b49/tododefemuvojoxebiduxir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65be0921-3862-417b-9bfb-9f6727dbff6d/xikugorusopiwuvoralonu.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_off00006d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D03 5580 bytes
SHA-256: 0cf89db502bec10a153585a71b773522bd9357d52d49d0afe7bd2c36b1bea870
font_01_sfnt_off0000800f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x800F 10228 bytes
SHA-256: 0b763d6282f4f795b34321915f94a6c252db0641d5111a451824cd698639bc9c

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