Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf94732d383a2aa…

MALICIOUS

PDF

45.4 KB Created: 2021-06-11 01:20:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7412815d03562a397133e90d95f87fd1 SHA-1: ac0f03046cfad8ed5531f705920899f67c5c7df9 SHA-256: 4cf94732d383a2aaad39be0fb28d85d70eaea289df4168465e45bb4cd3912a50
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising game hacks and generators. The primary lure URL is https://netcdn.tw/app/431946152/roblox-jailbreak-hack-android-game-hack, which is designed to trick users into downloading potentially unwanted or malicious software. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack aimed at driving traffic to malicious sites.

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.tw/app/431946152/roblox-jailbreak-hack-android-game-hack In PDF document text
    • http://cintabaca.org/katalog/repository/hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-free-spins-for-iphone_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-hack-apk-33-download_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-game-hacks_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/get-free-robux-no-hacks-and-no-buiders-club_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/pubg-uc-buy-ksa_GM1330123889.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/is-tiktok-free-to-watch_GM835599320.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-hack-without-verification-for-iphone_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-fix-cheat-engine-66-roblox-shutdown_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-free-spins-iphone_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/hacks-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-coins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-more-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000522a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x522A 25656 bytes
SHA-256: 908ca90339c66ecb167cba9f1ae35b8cf8618649d9057db033a5d6269495de68
font_01_sfnt_off00008df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF1 18640 bytes
SHA-256: 09b4d4eb1a0ea17934699fa09aecde514e7e1fe8bfc048c76a53b2ec5ffb9bc3

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