Malicious PDF — malware analysis report

Static analysis result for SHA-256 938e31b448f24416…

MALICIOUS

PDF

53.0 KB Created: 2021-06-09 14:41:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a59965a7763d331b87eb236196db1d56 SHA-1: 6a4fc7802aa43e9ffe9dc4c8216e82076be65ec8 SHA-256: 938e31b448f244167e8607b849b822878fca68e43ed55ac7f577ba202e7bf7af
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to a known malicious domain, disguised as a game hack. The document body, though heavily corrupted, contains references to the malicious URL. The presence of multiple redirector links and the ML classifier's high confidence indicate a malicious intent to lead the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9856

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/yin-vs-yang-roblox-cheat-game-hack In PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/instant-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-free-spin-link-twitter_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coinmaster-fan-page_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-free-download_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/minecraft-free-install_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/roblox-premium-free_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/how-to-use-wurst_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/free-coin-spin-daily-link-coin-master_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-robux-working_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-free-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-hack-apk-35-8_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/cheat-speed-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

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_off00005379.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5379 39092 bytes
SHA-256: b481bb80c636238632c361ad5a307be43d7503ecbc6629ce37ab01189b7274df
font_01_sfnt_off0000ab12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB12 18984 bytes
SHA-256: 8c13e1b5bd470b67c49520045772881b4f284ed740e8da7eba5b19c97bd40d95

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