Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46acadb166164a0…

MALICIOUS

PDF

45.7 KB Created: 2021-06-03 21:39:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 0e90a26cc504e5c4ff7481e3f9745730 SHA-1: 08a742d9780a2fc30b359065f244dd98fe08813b SHA-256: b46acadb166164a09faec8d754db1e7dcd058d87f8044febac3e34c68e2c9e8a
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering 'free generators' or 'game hacks', specifically mentioning Robux and Minecraft. One primary URL, 'https://netcdn.online/app/431946152/how-to-get-free-robux-gift-cards-game-hack', is identified as a malicious redirector. The document body, though partially garbled, contains similar lure text and the same primary URL, reinforcing the phishing attempt. The presence of a 'password-protected archive handoff' heuristic suggests the document may be intended to trick users into downloading an encrypted payload, which is often a precursor to malware delivery.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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-to-get-free-robux-gift-cards-game-hack In PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-cp_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/pokemon-go-free-account-username-and-password_GM1094591345.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/robux-free-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-roblox-dominus_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/minecraft-free-download-mobile_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-spin-coin-master-hacktoman_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/working-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-youtube-tiktok_GM835599320.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/minecraft-classic-free_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-free-tiktok-followers-without-human-verification_GM835599320.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_off00005287.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5287 25716 bytes
SHA-256: 64f05f1c997ba8b8a3daee62ffdbc130922150a36488857134b5ceb05f2f70f6
font_01_sfnt_off00008e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E7C 18804 bytes
SHA-256: db707177e1a0df533614fd289cf2b470ee37edf039339bb568c3977480a042bc

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