Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d219622334d522…

MALICIOUS

PDF

42.4 KB Created: 2021-06-04 03:52:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 190180cfe2b9a3cb319c33b7761d1a97 SHA-1: fa85883fcb1e42ef8349856957db04a76ce32122 SHA-256: e1d219622334d52214f1f9ec1deab53cabb403285087cb2f4313469e1e43f049
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting "game hacks" and "free generators" for popular games. The ML classifier strongly flagged this PDF as malicious, and heuristic rules identified it as a lure for game hacks and a link to known malicious redirectors. The embedded URLs are designed to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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/406889139/coin-master-daily-free-spin-app-game-hack In PDF document text
    • http://perpus.unpam.ac.id/repository/500-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-hack-online-no-human-verification_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/robux-generator_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/get-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-free-spain_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-to-play-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-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_off00004d8e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D8E 23504 bytes
SHA-256: ac305eb6b32a93d409d0decba3dce811c76d2b1a7d874eb294c80e94ddf2f7e3
font_01_sfnt_off000082e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82E4 18308 bytes
SHA-256: f9a3a46f76b0cae8a4d9bd0baf07f2a5aefd3f4554b846be65e0119e8f17791d

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