Malicious PDF — malware analysis report

Static analysis result for SHA-256 876a93578eaf020e…

MALICIOUS

PDF

46.7 KB Created: 2021-06-03 13:13:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f49097e2dfcb92f6c24c92372c8c4ec4 SHA-1: c75616960ff696e24ddd058b06485cf2540a5e57 SHA-256: 876a93578eaf020eb2f54a8dd999f82e170dd532f75acaf08aa458f516df4465
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically advertising game hacks and free generators. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of malicious redirector links and the lure suggest an attempt to lead the user to a site that likely hosts a further exploit or malicious download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/479516143/minecraft-book-collection-game-hack In PDF document text
    • http://library.umla.ac.id//repository/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-free-coins-and-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-pe-hack-client-ios_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hack-version-2021-download_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/minecraft-ore-finder-mod_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/aristois-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-many-levels-are-there-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-do-you-earn-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/roblox-generator-com_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-to-earn-free-pokeballs-in-pokemon-go_GM1094591345.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-people-girl_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-book-collection_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-spins-and-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-cards-link-2021_GM406889139.pdfIn 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_off000051c4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51C4 32348 bytes
SHA-256: eb05bff49c5019cc2cf09691a3623b9af5334969bf42dd7aaf407ae62105cd86
font_01_sfnt_off00009481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9481 18168 bytes
SHA-256: 399702d0ee70d7721e3b7d87823dce0b35203047caa5258f7323b07e9fdc19b4

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