Malicious PDF — malware analysis report

Static analysis result for SHA-256 a713e1ae43a5346a…

MALICIOUS

PDF

34.3 KB Created: 2021-07-20 08:32:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b063f181291a1bfb0446a3e45d9c29cc SHA-1: 2dbfc89d94bc06a82b1f9d411b3d86f802540e3f SHA-256: a713e1ae43a5346a7b883e773c833f24fd8e5ab840dbe2bcfebae32c00d02b69
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'game hacks' and 'free generators' for popular mobile games. The primary lure directs users to http://netcdn.tw/app/406889139/how-can-i-get-free-spins-on-coin-master-game-hack, which is flagged as malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit user interest in game cheats to drive traffic to malicious sites, likely for further payload delivery or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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/how-can-i-get-free-spins-on-coin-master-game-hack In PDF document text
    • https://www.tiancom.com.tw/upload/files/free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/minecraft-free_GM479516143.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/minecraft-gun-games-free_GM479516143.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/how-to-get-free-coins-on-tiktok_GM835599320.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/get-free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/minecraft-free-app_GM479516143.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-spins-and-coins-coin-master_GM406889139.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_002_off00002fb1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FB1 23460 bytes
SHA-256: 2ab00d44d45175fbd86b1b14181bf6876dfe77041a0168a1bda23f828f30d0b8
font_01_sfnt_off000064d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64D3 18052 bytes
SHA-256: f4ab70c7a1b321e89283bf56011259b2481f340c7b70b557de06403c5562b8cd

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