Malicious PDF — malware analysis report

Static analysis result for SHA-256 a664876c686c348c…

MALICIOUS

PDF

44.3 KB Created: 2021-05-16 16:37:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4bf84d54bb6f5b575fd35369ac578eef SHA-1: cdc814fc11102e2a05305debebe9186f62aae9a8 SHA-256: a664876c686c348c6fc0c27100c966254140e02b64c203e72ece3d0d87a4798f
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting game hacks and generators. The ML classifier strongly flagged this PDF as malicious, and the presence of redirector links indicates a phishing or scam attempt. While no scripts were explicitly extracted, the document's structure and embedded URLs suggest it's designed to lead the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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/moon-static-coin-master-generator-hacks-free-game-hack In PDF document text
    • http://force-seniorklub.dk/images/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://force-seniorklub.dk/images/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • http://force-seniorklub.dk/images/coin-master-50-spin-link_GM406889139.pdfIn PDF document text
    • http://force-seniorklub.dk/images/how-to-get-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://force-seniorklub.dk/images/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://force-seniorklub.dk/images/coin-master-free-spin-download_GM406889139.pdfIn PDF document text
    • http://force-seniorklub.dk/images/hack-coin-master-xyz_GM406889139.pdfIn PDF document text
    • http://force-seniorklub.dk/images/roblox-generator_GM431946152.pdfIn PDF document text
    • http://force-seniorklub.dk/images/wurst-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • http://force-seniorklub.dk/images/free-robux-kid-friendly_GM431946152.pdfIn PDF document text
    • http://force-seniorklub.dk/images/roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://force-seniorklub.dk/images/coin-master-free-spins-deutsch-download-ios-link_GM406889139.pdfIn PDF document text
    • http://force-seniorklub.dk/images/coin-master-daily-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://force-seniorklub.dk/images/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://force-seniorklub.dk/images/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://force-seniorklub.dk/images/free-robux-ad_GM431946152.pdfIn PDF document text
    • http://force-seniorklub.dk/images/cm-spin-link_GM406889139.pdfIn PDF document text
    • http://force-seniorklub.dk/images/roblox-got-talent-piano-hack_GM431946152.pdfIn PDF document text
    • http://force-seniorklub.dk/images/rbx-website_GM431946152.pdfIn PDF document text
    • http://force-seniorklub.dk/images/coin-master-app-hacks_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_off00004caf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CAF 27936 bytes
SHA-256: b16d1d39573c34c2d739dd2b649222353c5a3ccae3bf8dc0401f4c751f52da12
font_01_sfnt_off00008c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C32 17880 bytes
SHA-256: 12faecc5962592d277de3e4fe4bc4692cb4c94937b2745323735b12f582b8c4f

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