Malicious PDF — malware analysis report

Static analysis result for SHA-256 b618060f357d68b5…

MALICIOUS

PDF

50.8 KB Created: 2021-06-11 06:17:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: dcc03b3e3d5ab8e874517bc7a57e705d SHA-1: b675d835b4348b42ead01e62c8f146a11a3e4bee SHA-256: b618060f357d68b5d7409c186e8b6c00ca0463189da05d737b02f7059f10052f
220 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector infrastructure. The document body and heuristics suggest a lure related to game hacks and free currency, aiming to trick users into clicking these links. The presence of multiple external PDF links further indicates a link farm designed for SEO manipulation and traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.tw/app/431946152/cheat-engine-kill-al-script-roblox-game-hack In PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-get-free-gamepasses-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/teach-me-to-hack_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-games-like-minecraft_GM479516143.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/coin-master-hack-tool-download_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/roblox-how-to-get-free-shirts_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/coin-master-hack-apk-iphone_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-roblox-hair-boy_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/roblox-exploit-scripts_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-get-minecraft-bedrock-edition-on-pc-for-free_GM479516143.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/robux-hack-download-2021_GM431946152.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_004_off000052cf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52CF 29524 bytes
SHA-256: b5f561acfd75a8d536806bd3ac8d7eb6e8299049f0497628b19b47e3de35d11d
font_01_sfnt_off000095e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95E7 3608 bytes
SHA-256: 608f0dd4f6bfb6adbccec84228618ee8e4c9e09226d7330efb5300e499d1567f
font_02_sfnt_off0000a26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA26F 18868 bytes
SHA-256: 613eeeb07a440a9721e16d829f02e2dd3656a8bcefba07a5b37b27d427d8821a

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