Malicious PDF — malware analysis report

Static analysis result for SHA-256 19cd6340f5eb2bb6…

MALICIOUS

PDF

44.5 KB Created: 2021-06-04 02:34:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 96321d17a59a74bacc7f659005dc80a6 SHA-1: a5715183e1dbed936faaddddd20abd20ab60c5c0 SHA-256: 19cd6340f5eb2bb632f541e60b11800a309714ccbfb3a5e2008ca30af4580705
168 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple links to known malicious redirectors and hosts further malicious PDFs, masquerading as game hacks or generators. The document body and heuristics indicate a lure for free Robux or similar in-game items, aiming to trick users into clicking malicious links. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/how-can-you-get-free-robux-game-hack In PDF document text
    • http://lib3tell.stptrisakti.net/repository/minecraft-free-download-windows-10_GM479516143.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/free-tiktok-followers-without-verification_GM835599320.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/sites-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/scary-larry-roblox_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/robux-generator_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-instagram-free-spins_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/get-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/blox-best-robux_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/hack-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-33-hack-version-download_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-free-spin-and-trading_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/what-pubg-uc-buy_GM1330123889.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/how-to-get-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/hack-to-protect-village-on-coin-master_GM406889139.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_off0000501d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x501D 25012 bytes
SHA-256: dd41e63dc25183bf51388851e3ff4514bdb8e4bc21078d6ca1bb47ad5d226626
font_01_sfnt_off000089e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89E6 18672 bytes
SHA-256: b25769fe22a84510cbe545ecc77c61068e90e31ebb29fb78564d629eaf3a10b0

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