Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bae31904693d0e9…

MALICIOUS

PDF

47.7 KB Created: 2021-06-03 07:25:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6fdf394204e1ae4d800f96c7e50e85be SHA-1: 16c8f8dcd128666c3886e1889d2a6bc6dbe8ec1c SHA-256: 7bae31904693d0e92c24e15437e7a4b0141a0059948d330d01d97c80bc69b110
200 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, disguised as game hacks and free generators, aiming to trick users into visiting malicious infrastructure. The presence of a 'password-protected archive' lure suggests the document is intended to conceal a malicious payload. While no scripts were directly extracted, the nature of the lures and the ML classifier's high confidence indicate a malicious workflow, likely involving exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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 https://netcdn.online/app/431946152/can-you-get-free-robux-on-roblox-game-hack In PDF document text
    • http://digilib.stimata.ac.id/repository/minecraft-115-2-hacks_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-unlimited-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/roblox-bloxburg-free-money_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/100-free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/legitimate-coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/minecraft-mods-download-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-roblox-svg_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/robux-survey_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-get-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-free-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-free-daily-spins-today_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/flame-gg-free-robux_GM431946152.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_off0000512c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x512C 31292 bytes
SHA-256: d942861567aaf023a7aa1be6c4fa255fffd11d0ab12e4b0bc89c7ea3d911f5c5
font_01_sfnt_off00009723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9723 18580 bytes
SHA-256: 0d0c29456045ba8700eeeb9b5d08ef238a74b3c73615dbb1a220be23830403a6

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