Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b6beeb26789922…

MALICIOUS

PDF

33.9 KB Created: 2021-07-09 06:40:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 326c0fad774049944fbf030cb8c8f3a9 SHA-1: 5449a3dc5096560eff57c3e3f145960109fce65c SHA-256: b8b6beeb26789922dd345d1753326a5998eed9fa6fa98af5ff7116e333b9f434
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a redirector hosted on netcdn.tw, which is associated with malicious activity. The document body and extracted URLs suggest a lure for game hacks and cheats, likely to deliver a secondary payload or phish for credentials. No scripts were extracted, but the presence of malicious redirectors and the lure indicate a high likelihood of a phishing or malware distribution attempt.

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/coin-master-get-free-cards-game-hack In PDF document text
    • https://darulfalah-tulungagung.com/__statics/gudangsoal/files/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://darulfalah-tulungagung.com/__statics/gudangsoal/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://darulfalah-tulungagung.com/__statics/gudangsoal/files/real-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://darulfalah-tulungagung.com/__statics/gudangsoal/files/roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://darulfalah-tulungagung.com/__statics/gudangsoal/files/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • https://darulfalah-tulungagung.com/__statics/gudangsoal/files/hack-coin-master-download_GM406889139.pdfIn PDF document text
    • https://darulfalah-tulungagung.com/__statics/gudangsoal/files/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • https://darulfalah-tulungagung.com/__statics/gudangsoal/files/how-to-get-free-clothes-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://darulfalah-tulungagung.com/__statics/gudangsoal/files/free-give-away-codes-robux_GM431946152.pdfIn PDF document text
    • https://darulfalah-tulungagung.com/__statics/gudangsoal/files/hack-the-coin-master_GM406889139.pdfIn PDF document text
    • https://darulfalah-tulungagung.com/__statics/gudangsoal/files/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • https://darulfalah-tulungagung.com/__statics/gudangsoal/files/free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://darulfalah-tulungagung.com/__statics/gudangsoal/files/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://darulfalah-tulungagung.com/__statics/gudangsoal/files/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • https://darulfalah-tulungagung.com/__statics/gudangsoal/files/play-for-free-robux-roblox_GM431946152.pdfIn PDF document text
    • https://darulfalah-tulungagung.com/__statics/gudangsoal/files/hack-mod-coin-master_GM406889139.pdfIn PDF document text
    • https://darulfalah-tulungagung.com/__statics/gudangsoal/files/minecraft-free-ios_GM479516143.pdfIn PDF document text
    • https://darulfalah-tulungagung.com/__statics/gudangsoal/files/coin-master-hack-mod-apk-2021_GM406889139.pdfIn PDF document text
    • https://darulfalah-tulungagung.com/__statics/gudangsoal/files/free-minecraft-windows-10-account_GM479516143.pdfIn PDF document text
    • https://darulfalah-tulungagung.com/__statics/gudangsoal/files/today-coin-master-spin-free_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
font_00_sfnt_off00002fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FB9 22604 bytes
SHA-256: 39993edbcc2c16fd34a7ba5c84d483033d9f23c5740016ac63b3ffbc10bc8d35
font_01_sfnt_off0000620e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x620E 18172 bytes
SHA-256: 5d2ba4e6671a22cd3447e179d7f1c985698191887f082c2695de5349955ac1fc

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