Malicious PDF — malware analysis report

Static analysis result for SHA-256 35cde202eab3f2c4…

MALICIOUS

PDF

33.9 KB Created: 2021-07-05 22:57:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7ae778a2472d4b2f37366843da70b738 SHA-1: 7688ee2c8bdb528adb0caf15c5618152b872e0ba SHA-256: 35cde202eab3f2c48ab40a2aded89baf2a9dba68f47d2f5a8dda1ca5027f95e5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a critical heuristic firing for a game hack redirector lure, pointing to known malicious infrastructure. The document body and embedded URLs reinforce this by referencing free game hacks and generators, aiming to trick users into clicking the malicious link. The ML classifier also strongly flagged this PDF as malicious.

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/431946152/roblox-printables-free-game-hack In PDF document text
    • https://fib.ub.ac.id/sac//repository/free-minecraft-skins-pc_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-com-free-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/minecraft-pe-server-hosting-free_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-sell-a-free-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/hackeando-ordenadores-en-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-hack-coins_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-glitch-site-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-grab-the-child-hacks_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-custom-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/pokemon-go-basic-vs-premium_GM1094591345.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/good-roblox-hacks-that-can-effect-other-players_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-minecraft-java-server_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-pajamas-free-shipping_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-get-free-robux-on-phone-2021_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_off00002de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DE6 22316 bytes
SHA-256: a2366a19d4e492e30035c33ccf51a1bb25a35ff26f6ad0c5ef0552125165d2cc
font_01_sfnt_off00005f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F92 19028 bytes
SHA-256: 5f2f594151e0b08153158ab3eb68c79847db9c0319a43ac7edef6c56c0cde280

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