Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc3fc38111266e4…

MALICIOUS

PDF

47.9 KB Created: 2021-06-04 03:50:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: cdf60c173c6726ce796e52fc5bd6defb SHA-1: 261af191dd5ed0f2ca07c33bea65c4554df0d6d8 SHA-256: 8fc3fc38111266e4ab9b85c9fef3ce69c9c8d9b2ba93dc83446ee5db38bed1cb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically advertising free game hacks and currency generators. The document body and embedded URLs strongly suggest a social engineering lure to trick users into visiting these sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious redirector chain.

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/get-free-robux-no-human-verification-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-mods-in-minecraft_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-please_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/appsmobinfo-coinmasterhack-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-50-tiktok-views_GM835599320.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/pokeballs-in-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-spin-and-coin-blogspot_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-spin-links-coin-master-october-30-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-pocket-edition-apk-free-download_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-website_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/offers-for-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/i-got-hacked-on-roblox_GM431946152.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_off0000519b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x519B 24488 bytes
SHA-256: 496c27977c5518826cf0e7ee2fd5e8132051b62c21126cf177d50c0f2b30ae0c
font_01_sfnt_off000089b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89B3 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off000096c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96C5 18860 bytes
SHA-256: 77094cb8e4b41d81131149df95963a95cd1356d500cc75fcdf894a2f9afc6be7

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