Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55478c47e768e4e…

MALICIOUS

PDF

46.1 KB Created: 2021-06-04 03:23:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 064e20d16014f2f0fc7f5e0fe2c35d83 SHA-1: 3aa40ad094c9dcee7ae3c7e2c626eb17196d5210 SHA-256: d55478c47e768e4e713631cd2608231ab3457692bdc161d17505ff421170555a
160 Risk Score

Malware Insights

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

The PDF contains multiple links to a redirector hosted on 'netcdn.online', which is flagged as malicious and associated with game hack lures. The document body and heuristics indicate a deceptive attempt to trick users into visiting this URL, likely for further exploitation or malware delivery. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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/406889139/100-free-spins-for-coin-master-game-hack In PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/minecraft-hacks-115-2_GM479516143.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-hackers-list_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-free-spinv1-0apkpure-com-apk_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/tiktok-free-movie-website_GM835599320.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/is-roblox-free-on-xbox_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/robux-sites_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_off000050bd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50BD 24192 bytes
SHA-256: e812e9910d82d3fd31afd4deacbb5f4faeac3b3658fcee62b12dd1103ae4446f
font_01_sfnt_off0000881f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x881F 2824 bytes
SHA-256: a0d6c1ef1f7405ab05245801e4abbc2877925f97898db53811df9ab010e978fa
font_02_sfnt_off000091bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91BD 18164 bytes
SHA-256: 7606299dfa9380825ccbbaa06a4275f303ebe4faec3a3444b55fb030233e8f05

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