Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a804e32e1f6943…

MALICIOUS

PDF

35.2 KB Created: 2021-07-05 09:04:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e3629b79c1250b323c1c94582de3d8cf SHA-1: 9fddc5f4bc5d65277e0c4c7933df38e9b70c26e7 SHA-256: b6a804e32e1f6943115bdece0c964245723b3a24addcd0b6b391a6d776f4f6f5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, including a prominent link to 'netcdn.tw' which is associated with game hacks and free generators. The document body and embedded links suggest a lure for downloading potentially malicious applications disguised as game cheats or generators. While no scripts were directly extracted, the PDF structure and heuristic firings indicate a malicious redirector workflow designed to trick users into downloading unwanted software.

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-pe-016-0-apk-download-free-game-hack In PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/hacks-on-roblox-adopt-me_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-epic-face-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-have-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/hack-roblox-robux-cheat_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-hacks-for-iphone_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/roblox-ss-executor-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/is-coin-master-hacks-safe_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/roblox-password-hacker-online_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-be-a-admin-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/pokemon-go-free-60fps_GM1094591345.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/roblox-guess-that-song-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/roblox-one-piece-golden-age-devil-fruit-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/do-robux-generators-work_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-spins-coin-master-links-no-human-verification_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/every-free-item-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-get-cheat-engine-on-mac-roblox_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_off00003395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3395 21680 bytes
SHA-256: 898fa133f88dddc86b882d0b0abba9602570c5d29e498a7e2968dba1352d84ad
font_01_sfnt_off00006319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6319 19524 bytes
SHA-256: 2c1b2724e9f8d24eaf424e37f542e22724de6abfb49ca65165bfe174736ddb84

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