Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de378ec39a5e264…

MALICIOUS

PDF

45.1 KB Created: 2021-06-10 23:47:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 21e3c7bae7b2e893a1d0f06e74bd97ac SHA-1: 9689434e9a470cb3f996c4740bd99a3a5a2768b7 SHA-256: 8de378ec39a5e264a8cc2a43323b88024587d0af2011ae1777e75f51af0a6da5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as generators for free game currency or hacks. The document body and heuristics indicate a lure to trick users into clicking these links, likely leading to further malicious content or downloads. No scripts were extracted, but the embedded URLs and redirector heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/how-to-get-free-robux-no-skams-game-hack In PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-robux-games_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-get-free-spins-on-coin-master-android_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-tiktok-followers-app_GM835599320.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/http-bitly-coin-master-free-2021-spins_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-roblox-injector_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-get-a-free-dominus-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-hack-ios-download-2021_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-tiktok-views-no-verification_GM835599320.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-robux-no-email_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-hacked-accounts-list_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-hack-activegamer_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-coin-master-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-400-spin-link-hack_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-free-spins-link-2021_GM406889139.pdfIn 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_off00005195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5195 25140 bytes
SHA-256: 011d966a9b9c7d4f7bb7e87ed05976dc3c300ae4e03f167fd5d1b1b4bc3c84c7
font_01_sfnt_off00008ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA4 18940 bytes
SHA-256: 40909cd21fc14c8d50802aa6edf52291b4cd04aa44bff0e16ac673dc6bf9d1e3

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