Malicious PDF — malware analysis report

Static analysis result for SHA-256 319a3bdf61392940…

MALICIOUS

PDF

39.6 KB Created: 2021-05-10 15:13:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bbeebe082ad0bcb6e1d165024f692d43 SHA-1: eaa475b9a40c56b05b0bf5b11a0c11fe6f56bcec SHA-256: 319a3bdf61392940620d1d55d4f33969c3e59c813087634aab886ff039fad8ce
220 Risk Score

Malware Insights

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

This PDF document employs a common lure of 'game hacks' and 'free currency' to trick users into clicking malicious links. The document contains multiple links pointing to known malicious redirector infrastructure, specifically `https://netcdn.xyz/app/406889139/mcpe-master-coins-hack-game-hack`. Furthermore, it explicitly requests sensitive information such as recovery secrets or private keys, indicating a phishing or credential harvesting attempt. No scripts were extracted, but the presence of malicious links and the lure for sensitive data strongly suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.xyz/app/406889139/mcpe-master-coins-hack-game-hack In PDF document text
    • http://mostowicz.pl/images/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • http://mostowicz.pl/images/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://mostowicz.pl/images/minecraft-app-store-free_GM479516143.pdfIn PDF document text
    • http://mostowicz.pl/images/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://mostowicz.pl/images/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mostowicz.pl/images/optifine-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://mostowicz.pl/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://mostowicz.pl/images/coin-master-hack-version-apk-download_GM406889139.pdfIn PDF document text
    • http://mostowicz.pl/images/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • http://mostowicz.pl/images/coin-master-free-spins-heaven_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_003_off000040be.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x40BE 24944 bytes
SHA-256: f281119bacf6e710248c299a94e171f14ba183725f362095a170893b92e06208
font_01_sfnt_off00007a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A23 17892 bytes
SHA-256: d01168f9bbbfe6455f8e766ddb511a9b706125e6492a8429ac9dad2f06419671

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