Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d385f9c5bddd09…

MALICIOUS

PDF

77.9 KB Created: 2021-01-10 11:17:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1e574758728b63ac187588a644f52227 SHA-1: 69fa48fce63dbe737c3369187437b33cb01dc656 SHA-256: a2d385f9c5bddd0960d02111fdcf1dc36fb9e69e3b2dd19ded26a0d4aef973c0
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one specifically identified as a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to Excel functionality, likely to trick users into clicking the malicious links. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=rectangular+to+polar+form+in+excel In PDF document text
    • https://cdn.sqhk.co/sewujuzanas/jAijiiI/russian_car_drift_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/jehhhjQ/37760654440.pdfIn PDF document text
    • https://site-1178468.mozfiles.com/files/1178468/xepinenepumidejukuza.pdfIn PDF document text
    • https://xudepafuvinuk.weebly.com/uploads/1/3/0/9/130969511/94cf66927df9.pdfIn PDF document text
    • https://gotagifegu.weebly.com/uploads/1/3/1/6/131607164/sigaveto-zimeralamula-xubene.pdfIn PDF document text
    • https://site-1178248.mozfiles.com/files/1178248/mikecrack_diamantito_4_cancion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420238/normal_5f9fcaebcc665.pdfIn PDF document text
    • https://judurufag.weebly.com/uploads/1/3/4/6/134688768/fenutuvalimuro_sunutaluputubo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416319/normal_5fbc2f45b6a18.pdfIn PDF document text
    • https://cdn.sqhk.co/javijaxim/GuLhehc/99253771602.pdfIn PDF document text
    • https://site-1171989.mozfiles.com/files/1171989/bomber_crew_game_tips.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/excel_indirect_to_a_different_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/wow_classic_lockpicking_leveling_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30F 5116 bytes
SHA-256: e4913cc40e4d6567cc6127746f0cfb1209326036d86c011a7314056a289597dd
font_01_sfnt_off0000f468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF468 12356 bytes
SHA-256: eb404fd4d4c5603e603290c6693ae331afe913b9902e5319a1a7722f7340e0a7
font_02_sfnt_off00011c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C61 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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