Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb013d18228a7788…

MALICIOUS

PDF

46.1 KB Created: 2021-06-03 19:46:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a6a7f3587c570b7690d72b91962e715d SHA-1: f9af1dbc4508a5439e04e3cee905357a9c51d0b2 SHA-256: cb013d18228a77884deaea6ae329cce5143d790392ae935d02e11f9eb27c9cd8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links designed to lure users into clicking on them by promising free in-game currency or hacks. These links redirect to malicious infrastructure, specifically a URL associated with 'free Robux' generators. The ML classifier also flagged this PDF as malicious, indicating a high probability of malicious intent. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • 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.
  • 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/bloxawards-com-earn-free-robux-game-hack In PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/android-coin-master-3433-apk-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-coin-master-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/village-4-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/giftrobux-com-generator_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-coins-for-planet-master-game_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-hax-download-no-virus_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-hack-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/cmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-games-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coinmasterhack-club_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-coin-master-free-spins-in-email_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/you-promised-my-son-free-robux_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_off000051ee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51EE 27544 bytes
SHA-256: 2b986fdc7f96becc1a055e42dd7f8211cb857bd32bc50612435efd9d45162fd5
font_01_sfnt_off00008fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FCA 18916 bytes
SHA-256: ad6cfd8b97476ff22bd965746e6d59def3dc1c42c07a754b956efad1c533161c

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