Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ea2f8fb97b11f5…

MALICIOUS

PDF

47.9 KB Created: 2021-06-04 04:02:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4af192e98fe733c5d54160b30f4cc563 SHA-1: 12ddbfca6aea113793538aa8e41473c26605786e SHA-256: c4ea2f8fb97b11f59eb754d1df4afbeb034685a1c506c5f03c1f1d930ff17a9a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it links to malicious redirector infrastructure, specifically a lure for game hacks. The document body, though heavily obfuscated, contains a URL that aligns with the heuristic findings. The primary attack pattern involves tricking the user into clicking a link that likely leads to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.online/app/431946152/how-to-hack-a-account-in-roblox-game-hack In PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/pubg-uc-or-bp_GM1330123889.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/minecraft-switch-free_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/master-coin-hack-mod_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/install-free-game-coin-master_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/minecraft-realms-free-codes_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-download-minecraft-for-free-on-windows_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-spins-coin-master-without-completing-offers_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-spins-link-download-apk_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-redeem_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/pubg-8-uc-buy_GM1330123889.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-daily-free-cards_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-spin-2912-2021_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-coin_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050f6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50F6 25148 bytes
SHA-256: a893fb6acad5a539039b273fe379b85f51138e7aea63a2aeb425f3275f267cdd
font_01_sfnt_off00008ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC0 3884 bytes
SHA-256: 64ea6bfd232c3abde76d8b86727203bfa3f935a5783cd0c1f642cf6d3fb42b29
font_02_sfnt_off00009767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9767 18588 bytes
SHA-256: 473f4049eec8c5bd6021c8242389f51b1472f72e75f6d39bb193c1b84d329224

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