Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34d13ae2ff22a18…

MALICIOUS

PDF

42.6 KB Created: 2021-05-12 07:34:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 85043c38445677ae47240cf4a933d0b4 SHA-1: a3c50bcfb4b83c7528bdb9343884e5c77c256a61 SHA-256: a34d13ae2ff22a186b0492356864bce28acab42b647b39564c5485821b227b3c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to a malicious domain, identified as a known redirector infrastructure. The document body and embedded URLs suggest a lure for game hacks and free in-game currency, likely to trick users into visiting the malicious site. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/free-spins-coin-master-app-game-hack In PDF document text
    • https://library.kysm.edu.my/repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/coin-master-mod-version-free-download-34-4_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/free-spins-for-coin-masters_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/roblox-bux-free_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/how-to-get-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/minecraft-pocket-edition-apk-free-download_GM479516143.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/hack-coin-master-32-mod-apk_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/500-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/free-minecraft-premium-account_GM479516143.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/archery-master-3d-unlimited-coins-hack_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_off00004a8a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A8A 25604 bytes
SHA-256: af485b9f61efed340f25d70891d1a0192a1f280ac767f01b7f806d5e7c335b0b
font_01_sfnt_off00008598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8598 17884 bytes
SHA-256: ed1ea3c4e7635b9f65a5e0b6798c92341d7c1feababf17669f4466b6be8364ea

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