Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c86af1ddb240f5…

MALICIOUS

PDF

45.9 KB Created: 2021-06-04 03:47:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8f54711ecda0c52b5aba29de19a0775b SHA-1: f0ce50c8f622c1a6246c2065847690c0f2a37cd7 SHA-256: 84c86af1ddb240f56c66082e7eea1b8cd764f5444eb994bc985942e7675f201e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malicious redirector link disguised as a game hack lure, aiming to trick users into downloading a payload. The ML classifier strongly indicated maliciousness, and the presence of multiple links to known malicious infrastructure supports this. No scripts were extracted, but the document body and heuristics point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.online/app/431946152/google-how-do-you-get-free-robux-game-hack In PDF document text
    • http://www.digilib.uim.ac.id/repository/pubg-uc-u-mobile_GM1330123889.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/minecraft-dungeons-download-free_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/minecraft-free_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-coins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/smart-lodhi-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-robux-generator-tool_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-roblox-card-codes-unused_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-website_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-scams_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-outfits-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-cards-and-spin-link_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
stream_004_off000054bb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54BB 26140 bytes
SHA-256: 1cbd31664c7252454bfb71e7e057ff6c451b53471c367b74b0ce4b98839587a3
font_01_sfnt_off00008ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC6 18972 bytes
SHA-256: 7e42234451cc840f7005e057c881a5adaeb6eb05dfbb8a23217c49a1ae6b06df

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