Malicious PDF — malware analysis report

Static analysis result for SHA-256 96dcc2bae7efff4f…

MALICIOUS

PDF

44.0 KB Created: 2021-05-18 01:37:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b091f8bbf89d2cc21dae3924fa545524 SHA-1: b6d798d288896d0cff1af393a9fd0317a7532437 SHA-256: 96dcc2bae7efff4ff08d1e47c2f50e978f599d4c08d8ae87f98dd7b10f3be534
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, including a primary malicious redirector at https://netcdn.xyz/app/406889139/how-to-o-get-free-coin-master-spins-game-hack. Heuristics indicate this is a lure for game hacks and generators, and that the linked infrastructure is known to be malicious. The document body and extracted URLs suggest a phishing or malware distribution attempt disguised as a free game resource. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.xyz/app/406889139/how-to-o-get-free-coin-master-spins-game-hack In PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/coin-master-spin-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/minecraft-free-app_GM479516143.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/coin-master-free-spins-and-chips_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/synapse-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/universal-minecraft-converter-free_GM479516143.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/coin-master-free-2021-spin-link-today_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/coin-master-free-in-app-purchases-jailbreak_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/free-spins-on-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/robux-win_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/oprewards-robux_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/coin-master-free-spins-2021-generator_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/coin-master-hack-apk-with-fb-login-2021_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_003_off00004eb5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EB5 25552 bytes
SHA-256: 5b33fd0b7ca5cbe2c21c7dbb98ac31dff2734059a08e65629f892460b70c0e2a
font_01_sfnt_off00008a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A6B 18052 bytes
SHA-256: 1a49309645179e5aa03d30e235780e1615dc0ec238564b82d4d907f08b29e71b

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