Malicious PDF — malware analysis report

Static analysis result for SHA-256 515ddb37c7f0f403…

MALICIOUS

PDF

48.5 KB Created: 2021-06-08 16:22:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ccc4e9b4ae90e9681e7a6a773bc2a0fe SHA-1: 4a8a50d73d5d38601dd52cfd3930579355a1b7be SHA-256: 515ddb37c7f0f4037609249738f04f7f93fca8f0779c123a1c96ec2b45f9b306
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, disguised as game hacks and generators. The document body and heuristics indicate a lure to trick users into clicking these links, likely leading to further malware or phishing. The presence of a security bypass heuristic suggests an attempt to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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/roblox-how-to-get-free-robux-with-google-chrome-game-hack In PDF document text
    • http://library.unissula.ac.id/fk//repository/hack-coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-roblox-avatar-ideas_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/minecraft-for-ps3-free_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-spins-coin-master-ios-links_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-change-roblox-name-for-free_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-hack-2021-android-apk_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/minecraft-pe-apk-download_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-get-free-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-free-spins-ios_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/tiktok-free-fans-video_GM835599320.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-place-rewards_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/free-spin-and-coin-blogspot_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-get-free-chest-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-robux-generator-2021-no-survey_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_off000050b5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50B5 26720 bytes
SHA-256: cd7a102479f68200b8a057a106d172b305e37ff239365f41a7fee9e91068688b
font_01_sfnt_off00008dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DFC 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off0000979c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x979C 19388 bytes
SHA-256: fcb0980779290b6a089d1df175548a39a48481e77fc41b6904da16f6e55b70e6

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