Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9964c8ae000345c…

MALICIOUS

PDF

73.0 KB Created: 2021-02-06 21:46:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5455db63a0f774d5d7f9c21870fbef1b SHA-1: e5c50287728fabd70c0fc6a18d78257cda3280ec SHA-256: c9964c8ae000345c13f011c6effe88954e5b82ca1f72ce1241e70e13caa54156
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous embedded URLs, many of which point to disposable hosting or known redirector infrastructure. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to 'anime ships' and includes metadata from wkhtmltopdf, suggesting it was generated programmatically to host links. The primary malicious activity observed is directing users to potentially harmful external sites.

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://yafferge.ru/123?utm_term=best+yuri+anime+ships In PDF document text
    • http://xevidome.iblogger.org/chess_book_for_dummies.pdfIn PDF document text
    • https://rimofunoduw.weebly.com/uploads/1/3/4/5/134525219/6818919.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423772/normal_601d1814696b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455208/normal_6010e2bc18263.pdfIn PDF document text
    • http://triple-doska5.club/hillside_drive_mod_apk_unlimited_money_and_gemssx16t.pdfIn PDF document text
    • https://fonuwinozizanam.weebly.com/uploads/1/3/1/4/131408397/kigag.pdfIn PDF document text
    • http://housefashion.ru/povogexatodumumxmz2.pdfIn PDF document text
    • https://waboralitenir.weebly.com/uploads/1/3/4/5/134504299/fifobugonatogak.pdfIn PDF document text
    • http://zoom-omsk.ru/arslan_senki_s1_sub_indo_batch7hi2k.pdfIn PDF document text
    • http://rotixumuzu.22web.org/fimebilif.pdfIn PDF document text
    • https://sipesavuw.weebly.com/uploads/1/3/4/6/134697333/c86e9f97271.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jorunodup.rf.gd/petty_cash_balance_sheet_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/29132145167.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/birthday_cake_with_name_neha.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/mufufoga.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_off0000e3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AC 5176 bytes
SHA-256: 63fddce0cada251dfad30058f413a2f17dabe3c5efd933225686e4f5988d2b8e
font_01_sfnt_off0000f526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF526 10196 bytes
SHA-256: cdc448295e50e50293a30fb27a55000333d63c7b4db1ce04e55c51a0bab65710

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