Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15717b4c1b27d7d…

MALICIOUS

PDF

34.9 KB Created: 2021-07-04 16:05:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 221c4ccd61f5464e448b819f69981209 SHA-1: 75ff569d52a12a8f943362a512e4d224ff4df6d3 SHA-256: a15717b4c1b27d7d84ace328a6bc0bd3794f0d5bced7acebd363ae6b7bf3e325
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and cheats. The primary redirect URL is http://netcdn.tw/app/479516143/minecraft-windows-10-hack-client-2021-game-hack, which is flagged as a malicious redirector. This suggests the document is designed to lure users into downloading potentially unwanted or malicious software by exploiting interest in popular games.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/479516143/minecraft-windows-10-hack-client-2021-game-hack In PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-builders-club-free_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/all-coin-master-spin-link-and-free-download_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/best-sites-for-free-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/minecraft-pe-017-0-apk-free-download-android_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/toolbox-for-minecraft-ios_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/roblox-its-free_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-robux-for-free-and-fast_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/claim-free-robux-obby_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-time-speed-hack_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/cheat-prison-break-roblox_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/minecraft-116-apk-download_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-village-4_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/daily-spin-coin-master-free_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
font_00_sfnt_off000031fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31FA 22080 bytes
SHA-256: b42b91ae1229f0b49849089112e149d4199c8485060105466859d307908d7806
font_01_sfnt_off000062d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62D4 19180 bytes
SHA-256: 631b597843e25ada33697e5f3155324c1df943ac46bb1cd3b3d04c90488ab689

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