Malicious PDF — malware analysis report

Static analysis result for SHA-256 43951c9781859a8e…

MALICIOUS

PDF

45.5 KB Created: 2021-05-19 22:42:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 76e7a335a32711904623c9ff30d19dca SHA-1: f023fe6b021b8ca6719a865aee1f80f96906ed09 SHA-256: 43951c9781859a8e856d553db82c024fc575e6f1b507772fd8f44312be23a0a1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as "game hacks" or generators for popular games. The document body and heuristics indicate a lure to download or visit these malicious sites. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent, likely leading to further malware downloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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.xyz/app/1094591345/how-to-get-free-pokeballs-in-pokemon-go-2021-game-hack In PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-spins-for-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-roblox-groups_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-gfx-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/wurst-download_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/minecraft-book-collection_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-earn-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-pe-free-download-ios_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-pc-download-free-full-version_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-minecraft-account-list_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/minecraft-java-server-hosting-free_GM479516143.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
font_00_sfnt_off00004bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BFA 24304 bytes
SHA-256: dd37f025955a01d1c327c6410dd839f434b764e52c8246f2abd24d4980b95e6b
font_01_sfnt_off00008358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8358 2920 bytes
SHA-256: 601c50867a41b9362538ff18e5f9479a0f9badf698aaf1eb7e88469c11719db7
font_02_sfnt_off00008d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D72 18972 bytes
SHA-256: f57f34917b3454d4c0de8703bb73c0b0e604efd6fae66a4ee70ca3e4c2f09811

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