Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c56325897f907b8…

MALICIOUS

PDF

45.0 KB Created: 2021-06-09 03:16:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 5dee20cec44ee077ab4c17c2150ba239 SHA-1: 650b3c987319270be9a6f1bf6dfcdfb92db33678 SHA-256: 1c56325897f907b8706cd97c247e9c06adc030fd87d5d7bcc52c26572bc09d32
160 Risk Score

Malware Insights

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

This PDF document employs a common lure, promising free game-related items to entice users. It contains multiple links pointing to known malicious redirector infrastructure, which likely leads to further malicious content or malware downloads. The ML classifier also flagged this document with high confidence.

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/roblox-free-gift-card-codes-2021-game-hack In PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-mast-hacks_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-roebucks_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-minecraft-hosting-24-7_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-free-accessories_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-roblox-followers-generator_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-robux-app-real_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-spins-promo-code-for-coin-master_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-coins-facebook_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-get-tiktok-followers-free_GM835599320.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-hack-online-pc_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-gold-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-hack-a-roblox-account-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
stream_004_off000050a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50A5 25300 bytes
SHA-256: 32c5f9cdd15545c46eff65ea8fe8e124bd8b87b4c1a6be89e3c168e508d0650e
font_01_sfnt_off00008af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF3 18976 bytes
SHA-256: a4d60524910126fdc4a2614bbb0f19a454584a3064da0ebd771b2eb7d9e0ede2

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