Malicious PDF — malware analysis report

Static analysis result for SHA-256 68842576013dc2b0…

MALICIOUS

PDF

34.3 KB Created: 2021-07-03 13:45:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0b85e3011ad4fb5996084598c0202049 SHA-1: f4440bbd1a3bcabcfa7dcc435c7cfbc08c9a4140 SHA-256: 68842576013dc2b037784403515e36ed3a38b950483a1b654d1b6516eabf0a26
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it links to malicious redirectors and lures users with game-related content. The primary URL, http://netcdn.tw/app/479516143/minecraft-hacked-client-download-game-hack, is flagged as a malicious redirector. Although no scripts were extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack designed to trick users into downloading potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/479516143/minecraft-hacked-client-download-game-hack In PDF document text
    • http://library.persadabunda.ac.id/repository/rbx-roblox-robux_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-heaven-daily-free-spins-and-coins-links_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-website_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/pokemon-go-free-key_GM1094591345.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-minecraft-skin-creator_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/roblox-robux-hack-2021-may_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-level-7-script-executor-roblox_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/best-free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/hack-coin-master-apk-ios_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-roblox-accounts-with-robux-2021-october_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/earn-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-with-private-group_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
font_00_sfnt_off0000313c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x313C 22120 bytes
SHA-256: 183b1436691eaaf7194d4ac22a3839a5a4c730a1e8ea86a38503fa0d98198772
font_01_sfnt_off00006212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6212 18748 bytes
SHA-256: aa0b1002d10e7fb60172ce49cbdaa5952bdb54bf3081edf3cb6a3acd957b60a1

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