Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2519944b50e5a2c…

MALICIOUS

PDF

45.8 KB Created: 2021-06-03 13:42:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f2d323aed54a20e6fd0759d119f72096 SHA-1: bf538b93a880de426790c2b32ac78c6c277ba7a0 SHA-256: e2519944b50e5a2c496ed15b3cf040e32bac2543ed48be927ed76cecb7d2f0a9
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and SEO-optimized PDF files, masquerading as 'free generators' or 'game hacks'. The primary malicious URL identified is https://netcdn.online/app/431946152/free-robux-hack-no-human-verification-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a malicious redirection workflow, likely intended to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://netcdn.online/app/431946152/free-robux-hack-no-human-verification-game-hack In PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/minecraft-games-free-to-play-online_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/clients-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-heroes-online_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-promo-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/get-free-spins-coin-master-october-2021_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-15-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-much-pokemon-go-free-account_GM1094591345.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000507c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x507C 26812 bytes
SHA-256: dd496d715c589fdcb4b4f46f9217f23aef9d79043c036f797503383d78299e85
font_01_sfnt_off00008e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E32 19028 bytes
SHA-256: 768a4e91d7c3975acc2b79a699acb909e0f8bbf2befa87684aa1b4f9aecc197e

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