Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ce894d71b47ef5…

MALICIOUS

PDF

45.4 KB Created: 2021-05-13 00:12:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6c40c5e98f21d7fe7d8f40f44dfccce5 SHA-1: 0ae486b1e8f732a5ba384cf3f2441dfb68817e86 SHA-256: b4ce894d71b47ef5fc366ad7a4bed4511c45a2d564eca39bba5f62ce667be8c2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to known malicious infrastructure, specifically advertising game hacks and free generators. The document body, though partially corrupted, contains text related to 'Coin Master' and a URL that aligns with the heuristic findings. The presence of embedded URLs and the nature of the lure suggest an attempt to redirect users to a malicious site, likely for further exploitation or credential harvesting.

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/406889139/how-to-get-free-pet-food-on-coin-master-game-hack In PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/coin-master-free-spins-link-2021-iphone_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-gifts-coin-master_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/how-to-get-a-free-dominus-in-roblox_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-studio-free_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-free-play_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/haktuts-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/minecraft-free-android_GM479516143.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/robux-hack-me_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-headless-head-roblox_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/easiest-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-robux-no-apps_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
font_00_sfnt_off00004a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A9F 25428 bytes
SHA-256: c88cb8ec3ef14d5bbfa6ac41abc100e693fe58129c23c7c6668448ea4701586d
font_01_sfnt_off00008420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8420 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off00008f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F4A 18200 bytes
SHA-256: ff82f51d7232829588729013e130c6bedc3d39e4fe745f7f2d9ded29e0868acc

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