Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab23b99c57ee605…

MALICIOUS

PDF

36.1 KB Created: 2021-07-06 17:56:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 979ec174011bf21310af775544ea5572 SHA-1: 8c9b518aa9b5dee871854ea2fc8d0c5c4597f59f SHA-256: 3ab23b99c57ee605ad72566fb64218ccc0f637930b3a0beb5bc0555aab57d650
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to a known malicious redirector, specifically http://netcdn.tw/app/406889139/daily-free-spins-for-coin-master-game-hack. The document body and embedded links are designed to lure users into clicking these links by promising game hacks or free currency. The presence of these malicious links and the ML classifier's high confidence score indicate a high likelihood of this document being used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/daily-free-spins-for-coin-master-game-hack In PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-just-click_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/buy-robux-free_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/zyrus-12-roblox-hack-exploit_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/mcpe_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-texture-packs-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-apk-mod-free-download_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/rexgg-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-gift-card-codes-generator_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-yammy-hacking_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-tiktok-likes-no-survey_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_002_off000033b5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33B5 23700 bytes
SHA-256: 1d83784304f105ae4f03027149d359b393c838c241b3690e9607693d880011f1
font_01_sfnt_off0000699a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x699A 18596 bytes
SHA-256: d68a34b156bc539a9175b9519b639082689f9c1ce84e1c9e30ec2d7eb2f7d22d

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