Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc82f099e894b0fd…

MALICIOUS

PDF

32.0 KB Created: 2021-07-06 04:22:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: fcfeaec70d57bc3ddddaa8fd2e5ed85b SHA-1: a34ceb5e924677f64e4be8be5b0d4bcd69bea976 SHA-256: dc82f099e894b0fd98293b3a1b5ca80a9d6a50c54dcb819f52a9999c7ff85632
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to malicious infrastructure. The document body also contains the same malicious URL, reinforcing the lure. While no scripts were extracted, the primary attack pattern involves redirecting the user to a malicious site via an embedded link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/835599320/tiktok-free-98-game-hack In PDF document text
    • http://lib.akper17.ac.id/repository/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-email-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/easy-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/minecraft-apk-download-free-11-055_GM479516143.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/earn-robux-today_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/roblox-redeem-card-codes-free_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coinmasterfree_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-hack-pc_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-hack-spins-ios_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-spin-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/mcpe-master-free-coins_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/fb-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-hack-spins-2021_GM406889139.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_off000028a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28A0 22392 bytes
SHA-256: efa782cbf072dfb324c723fa99de664ad01cd96e4d58d516791a394c930369d9
font_01_sfnt_off00005a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A25 18344 bytes
SHA-256: 20de4d7e09184bd264db705af7f8f4d8904eabf3cd974e3e1f29c13c40714512

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