Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23aabffdb6ab220…

MALICIOUS

PDF

34.2 KB Created: 2021-07-03 18:56:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: aa99f0f479598e86165dd72c32a7bf0d SHA-1: 0c6a2eab498b501733776d60206ea4990514fdd4 SHA-256: b23aabffdb6ab2200f8d060f6fe4bff7c4371e72e86164ad606a5ff8d70f46aa
160 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links, specifically targeting users interested in game hacks like 'Coin Master'. The document body and embedded URLs point to a redirector at 'http://netcdn.tw/app/406889139/apk-hack-coin-master-game-hack', which is flagged as malicious infrastructure. This suggests the PDF is designed to trick users into downloading potentially harmful applications or visiting further malicious sites.

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/406889139/apk-hack-coin-master-game-hack In PDF document text
    • https://humansci.kyst.com.tw/image/data/files/spinuri-gratis-coin-master_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/image-de-tshirt-roblox-free_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-hack-version_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-redeem-cards-2021_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/hack-for-rpg-world-on-roblox-to-get-money_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-free-2021_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-free-spin-software_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/roblox-free-hair-boy_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-wins-in-anarchy-roblox_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/roblox-shotgun-lua-hack-command_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/robux-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-game-codes-roblox_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-coin-link-for-coin-master_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_off00003088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3088 22640 bytes
SHA-256: 06153c8600ea80c1bcc69b59698b671c2a3badd203a2f0b35b8fd86d4d96568c
font_01_sfnt_off00006348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6348 18180 bytes
SHA-256: bbc4eac059efcf8bf1e74c2581f3a6bb8c6757dc141f09cf3b32e8008e1b5aa4

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