Malicious PDF — malware analysis report

Static analysis result for SHA-256 39cb3aea18efeba7…

MALICIOUS

PDF

47.4 KB Created: 2021-06-04 01:51:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 5a06049cd93ee2f0cd248fc1caea6836 SHA-1: 0c30463677591238677a8b7cb374e7af39343659 SHA-256: 39cb3aea18efeba7c8f7e53c209f02dbd7da11c64c1f0682f4e639b29c2a25d6
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. The primary lure appears to be related to 'Coin Master' and 'game hacks', aiming to trick users into visiting the malicious URL. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure suggest a phishing or social engineering attack. The document body, though partially corrupted, contains references to the malicious URL and other potentially malicious PDF links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/406889139/coin-master-daily-link-game-hack In PDF document text
    • http://ebook.itn.ac.id/repository/free-roblox-gfx_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/download-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/minecraft-java-free-download_GM479516143.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/oginject-co_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/free-robux-no-email_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/hacked-roblox-game_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/free-coins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/como-hackear-el-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005052.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5052 26148 bytes
SHA-256: b49e77584c1e7a6c57dd56b73dabb63cf9f85f353130671b3a7b342b25bce78d
font_01_sfnt_off00008cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF5 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off000096a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96A8 18136 bytes
SHA-256: de8adbae9b98791aafa7b1c9845ab8ec9bced530f59257e9f1ec036c02100ceb

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