Malicious PDF — malware analysis report

Static analysis result for SHA-256 a519a2666315fe49…

MALICIOUS

PDF

48.8 KB Created: 2021-06-09 14:25:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 6c4e869d222aa151fbad8e7f06258b83 SHA-1: 80a6b95aceaf809f48f4c80a1d49d3a1c468c72c SHA-256: a519a2666315fe4939a06e509ffab8a22c731ccb6528d6bee58a977dfc845bca
160 Risk Score

Malware Insights

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

The PDF contains a link disguised as a game hack generator, which redirects to malicious infrastructure. This lure is a common tactic for phishing or malware distribution. The presence of multiple redirector links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/download-cheat-roblox-jailbreak-for-pc-game-hack In PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-creator_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/spins-gratis-coin-master-hoy_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-spin-coin-master-instagram_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-card-hack-apk_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-hack-someone-roblox-account-2021-july_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/robloxclick-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-make-a-server-in-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/minecraft-free-download-2021_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/minecraft-apk-download-free-11-055_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/cool-backgrounds-roblox-free_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/get-free-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/lazyblox-com-free-robux_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_off000051f3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51F3 27704 bytes
SHA-256: ce391a6ae11a7a8de91380d81ef86b6247f7b746d5de1279e9aa655cc86cb1de
font_01_sfnt_off00008ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EAD 2836 bytes
SHA-256: fd98c8f6e7c2e74bbd5822409159a93ac5c94da083ae4c2eb269d4284375f9e8
font_02_sfnt_off00009853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9853 19560 bytes
SHA-256: c805a26391df40ee10972e75186b1c73e433e77873bde00d930c3aa30d9e4d54

Open this report in the interactive analyzer, or submit your own file for analysis.