Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c72bcd3d907865…

MALICIOUS

PDF

35.8 KB Created: 2021-07-04 03:31:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 43e439f24a5057596e1a83c2f48530c6 SHA-1: d24eb3bf318f59e9145a02cbb15e70a580dd72af SHA-256: 61c72bcd3d907865d4c047846593151337e5bd329bae9b3984a83abee853ac3b
160 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to a known malicious infrastructure, specifically advertising free game currency and hacks. The primary lure is the URL http://netcdn.tw/app/406889139/coin-master-hack-spins-and-coins-unlimited-free-download-game-hack, which is designed to trick users into clicking through. The document's structure and content strongly suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

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/coin-master-hack-spins-and-coins-unlimited-free-download-game-hack In PDF document text
    • https://www.yantan.com.tw/upload/files/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/how-to-win-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/caesar-emergency-department-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/free-robux-com-au_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/roblox-printables-free_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/free-robux-hack-no-human-verification-or-download_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/roblox-i-can-play-for-free_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/how-to-make-a-minecraft-bedrock-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/roblox-how-to-get-free-obc-2021_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/free-robux-rbx-membership-claims-and-generators_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/free-spin-coin-master-twitter_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/free-robux-planet_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/free-robux-no-verification-required_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
font_00_sfnt_off00003277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3277 23120 bytes
SHA-256: be8ac2190241f98179d4a59ba13f697fe99f0b0a7d40f97ce640393550f5022f
font_01_sfnt_off0000664b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x664B 19368 bytes
SHA-256: add0edf7dd0394884c443ca24fd48469f9919274a259a3af7eac1d2f3d12793d

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