Malicious PDF — malware analysis report

Static analysis result for SHA-256 83371fdf6ad1ee86…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 06:53:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2ebef26811b19289e3fdbbaf07c98bfa SHA-1: a66962cef3d848bf7996ec2d426e36cfc618bb37 SHA-256: 83371fdf6ad1ee8686156b0578cea59f5f78aabf205c825c857502692d200181
82 Risk Score

Malware Insights

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

The PDF document uses a lure related to 'free game hacks' and 'Minecraft Java Edition' to entice users to click on an embedded URL. This URL, http://netcdn.tw/app/479516143/minecraft-java-edition-download-free-game-hack, is flagged as a redirector and likely leads to the download of a malicious payload. The ML classifier strongly indicates maliciousness, and the overall pattern suggests a phishing or social engineering attack aimed at tricking users into executing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-java-edition-download-free-game-hack PDF link annotation
    • https://3qblocks.com.tw/image/data/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/how-to-get-250-million-robux-for-free_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-face-roblox_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/mc-update_GM479516143.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-summer-grl-roblox-skins_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/how-to-get-free-hats-on-roblox_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/roblox-free-body_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/change-your-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/real-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-robux-from_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-free-spins-daily-1-ga_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-bonus_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_off0000315b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x315B 22428 bytes
SHA-256: 182ce5a0dac3275cc28e93776745a7893d68fe35e8f2fd8b15754f6ec7ed98e5
font_01_sfnt_off00006366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6366 18856 bytes
SHA-256: 5b5dffd1801a7646d4903e54774a45840ad7d6456fb30c9e0aec91f174fc5586

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