Malicious PDF — malware analysis report

Static analysis result for SHA-256 8785a9b5f4532f44…

MALICIOUS

PDF

36.8 KB Created: 2021-06-19 02:58:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 34d216b8e5687bf190f1a0cb0b2bf93b SHA-1: 09a1b35ab321ff31ff1a5fc29484d7291d18687d SHA-256: 8785a9b5f4532f44c515b02db903e38d41a9c2f0428109791ea3dd7dca36d2b3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links, specifically targeting users with lures for game hacks and free in-game currency. The embedded URL http://netcdn.co/app/431946152/roblox-bee-swarm-simulator-free-diamond-egg-game-hack is identified as a known malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect users to a malicious site, likely for further exploitation or malware delivery.

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.co/app/431946152/roblox-bee-swarm-simulator-free-diamond-egg-game-hack In PDF document text
    • https://edu.kyst.com.tw/image/data/files/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-roblox-injector_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-rewards_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-login-hack_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/if-everything-on-roblox-was-free_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-tiktok-followers-no-survey-or-verification_GM835599320.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-free-spins-and-coins-haktuts_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-get-free-robux-without-human-verification-on-computer_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-real-hack_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-roblox-accessories_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/apk-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/minecraft-pocket-apk_GM479516143.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/redeem-roblox-card-free_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000368c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x368C 22504 bytes
SHA-256: 954bbb365a3b1a87f47c872105a1e2923b9a18b05547206fe917da74a8a2492b
font_01_sfnt_off000068df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68DF 19780 bytes
SHA-256: b6b2e2783be1ce9117842d0a9b586eb6b7c4a86a43474d9ad17e67b7218e5830

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