Malicious PDF — malware analysis report

Static analysis result for SHA-256 db65e23fbe68bc8f…

MALICIOUS

PDF

34.3 KB Created: 2021-07-03 20:15:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f978c67099578f321093f4e5854d162e SHA-1: 44a521739abdb37dd16dcd6c9c5d449db0d54a99 SHA-256: db65e23fbe68bc8f36c389be233cb957f4869f0e9624587e6f2683694e8147c7
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a redirector URL that promises free game currency and hacks, a common lure for phishing or malware delivery. The heuristic firings indicate the PDF links to known malicious redirector infrastructure and is flagged by an ML classifier. The document body, though partially garbled, contains similar lure text and URLs, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/406889139/free-coins-coin-master-spins-game-hack In PDF document text
    • http://library.ft.upnvj.ac.id/repository/coin-spin_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/free-prankster-face-roblox_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/coin-master-free-coins-and-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/april-2021-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/free-private-minecraft-server_GM479516143.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/coin-master-hack-online-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/pig-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/safe-free-robux-no-password-or-human-verification_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/free-robux-20212021202120212021202120212021000-robux_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/roblox-red-hair-free_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/free-accessories-alfheim-online-roblox_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/beasiest-robux-hack-in-the-world-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/coin-master-free-spins-link-ios_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/free-robux-master_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/coin-master-free-spins-link-today-instagram_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_off0000312c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x312C 22668 bytes
SHA-256: e049662c3c80f6b4288c8c41315d0923bdb9be35705b1bc3c8c4c690b8ed0975
font_01_sfnt_off000063dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63DC 18176 bytes
SHA-256: 9c216cc6aa1e94c18ff26070eb99056dac407022fd31ef3f29cf2ac34e799f34

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