Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1951fc150beb7f…

MALICIOUS

PDF

44.2 KB Created: 2021-06-03 05:59:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 99b6df5c74286d187615a58c0036e6dc SHA-1: 7228c9672596553823b23d33db60fa746b3ff5fd SHA-256: 3a1951fc150beb7f6a0a47f0522d8a6c6b029b06b4d642ab34cbf8f78452af58
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and game-related lures, such as 'free generator / game hack'. The document body, though partially corrupted, also contains a URL pointing to a game hack download. These elements strongly suggest a phishing or malware distribution attempt, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.online/app/479516143/minecraft-114-4-download-game-hack In PDF document text
    • http://library.ulb.ac.id/repository/how-to-change-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-daily-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-com_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/minecraft-xbox-one-code-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/give-me-robux-now_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/archery-master-3d-coins-hack_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/minecraft-menu_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/hack-download_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-hax_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/hack-coin-master-apk-31_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/hack-para-roblox-comandos-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/roblox-inappropriate-games_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/is-coin-master-free_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-please_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
stream_004_off0000509f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x509F 25296 bytes
SHA-256: d9a7c8c3493ae94c84bab8f040f46dec638c85e74d5ec412dc2bee00275c2356
font_01_sfnt_off000089b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89B9 18460 bytes
SHA-256: f31f00f072c4c0f7507ec5fb42d1fedb33e944277bd3ae629218294143e3c054

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