Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1e22bafa811f90…

MALICIOUS

PDF

46.6 KB Created: 2021-05-16 21:33:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f7d205e6e6f6c3cf8698bd3ebe9aafb7 SHA-1: ed70ae776935836e9dfe9b17406162996983306c SHA-256: 7d1e22bafa811f902ff8557d98bd661d07487d8e8fef7cfa9658dbe3f14083b6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to what appears to be a malicious redirector, disguised as a 'free generator / game hack'. The document body and embedded URLs strongly suggest a lure for game-related cheats or currency. While no scripts were directly extracted, the PDF structure and the presence of numerous links to potentially malicious infrastructure indicate a phishing or scam attempt, likely leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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.xyz/app/431946152/free-roblox-passwords-game-hack In PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/freespinandcoin-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/synapse-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/how-to-get-unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/coin-master-hack-2021-app-download_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/game-hunters-coin-master_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/coin-master-free-spins-link-no-verification_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/coin-master-35-16-hack-apk_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/if-i-uninstall-minecraft-can-i-reinstall-it-for-free_GM479516143.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_003_off00004b92.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B92 25436 bytes
SHA-256: d61c28e32cafded8fa23115938d770ad9639c9401789b8a7e9eecca50311a8ec
font_01_sfnt_off000085ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85BA 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00009261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9261 18668 bytes
SHA-256: 2fa2c5403ec1c86ab3807ffc76d8ff15a2d608ae4c9a7b06441cca7eaabeec69

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