Malicious PDF — malware analysis report

Static analysis result for SHA-256 19744cb4fe97e41b…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 05:18:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a663257c413a05eff118d1580f2d4e0e SHA-1: ef6ba2fb3492f089a382a6c52ffd72c778042917 SHA-256: 19744cb4fe97e41b4db8235e10c5ea38f64a782cf84cc3b142ca185fd2f72624
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector pointing to 'free generator / game hack' content. The presence of embedded URLs and a lure for a 'download' suggests a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a likely attempt to redirect the user to a malicious site, potentially for further exploitation or credential harvesting.

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/835599320/tiktok-free-like-followers-game-hack In PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/haktuts-free-spins_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/1x1x1x1-roblox-id_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/roblox-g_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/how-do-you-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/coin-master-free-spins-1701-20_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/minecraft-free-school_GM479516143.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/corn-master_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/coin-master-cheats-for-free-spins_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/como-hackear-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/minecraft-free-install_GM479516143.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/coin-master-online-free-spin_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/free-robux-scam_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/tiktok-free-fans-and-likes-app_GM835599320.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/free-face-roblox_GM431946152.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_off00003585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3585 22032 bytes
SHA-256: 051baa7d30e09d2586b4bc5afbf61025924073fb3274aef53534a69e02fa6b25
font_01_sfnt_off00006633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6633 18208 bytes
SHA-256: 7d7b9c75d4be1bbf0896d69b405db974f94cf8ebec0f22d99abe89281e7be74d

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