Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c55cef68585649…

MALICIOUS

PDF

43.9 KB Created: 2021-06-03 08:52:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 073b58c2e3182bf7ed021d10b6c670f1 SHA-1: 61c72765bed20ae63be7ecbc8ce04c010cb5ac5b SHA-256: f7c55cef685856499220829203903aa2f88ae9039f07756197b967b9bd8704b4
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and infrastructure, disguised as game hacks and generators. The ML classifier also flagged this PDF as malicious. The embedded URLs likely lead to further stages of the attack, such as downloading additional malware or phishing for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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/toolbox-for-minecraft-pe-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/master-coin-hack-app_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-net-free_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-free-bundles_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-no-generator_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/redeem-roblox-card-free_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/best-free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-coins-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-apk-35-13_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/lots-of-robux_GM431946152.pdfIn PDF document text
    • https://www.youtIn 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_off000051ed.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51ED 24528 bytes
SHA-256: a525152d658a030ed75230f816ea27365b8de1161c30c61258ea507344b58a88
font_01_sfnt_off00008902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8902 18308 bytes
SHA-256: cad0c1d0267ccf17e6d6e466e5a8f19958f4fbf249f5d0def9b4b0a3839f8161

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