Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c7f893c7619ed4…

MALICIOUS

PDF

45.4 KB Created: 2021-06-11 06:12:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 974e43bf5ef35bf0be0fe6717f76dd86 SHA-1: 80af072fff79a600cf20a860d0e1eebe00af504b SHA-256: a9c7f893c7619ed49d755f9c49dca754ecd21fff05a97b527d7a79ecac94dd4b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a 'free generator / game hack' and embeds a link to known malicious redirector infrastructure. The ML classifier also flagged this PDF with high confidence. While no scripts were extracted, the embedded URL is the primary indicator of malicious intent, likely leading to a phishing or malware download site.

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/free-800-robux-code-2021-game-hack In PDF document text
    • http://elibrary.fl.unud.ac.id/repository/pokemon-go-free-zip_GM1094591345.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/roblox-lucky-block-hack-script_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/easy-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-apk-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-to-walk-through-walls-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/mcpe-client_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/minecraft-pc-download-free-full-version_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-the-fuck-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-get-stuff-that-cost-coins-free-mcpe-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/roblox-blood-and-iron-hack_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-spins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/minecraft-gun-mod-download-free_GM479516143.pdfIn PDF document text
    • https://www.roblox.comIn 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_off0000516f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x516F 26060 bytes
SHA-256: 04912b2d56a169e0b93175e8ded2a978bdb65d23b7ecf9e4088cc10923c1cec6
font_01_sfnt_off00008d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D2C 18800 bytes
SHA-256: 0cc62cc632a4edae41cce1f1de61805cbc74998f01c52cfcc5c43fd80ee2438c

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