Malicious PDF — malware analysis report

Static analysis result for SHA-256 632a0bbd601dce7c…

MALICIOUS

PDF

40.7 KB Created: 2021-05-19 15:47:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e0896cb0b26384b602fd2ccfa0b26dc2 SHA-1: 494d3b7a18bf0db97063340b78a36fa660b9cdf3 SHA-256: 632a0bbd601dce7c286049b4ac6c7af185e8e79c8723ee071efa8fbe4ce1a831
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/get-free-spins-coin-master-game-hack PDF link annotation
    • http://nod74.ru/images/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://nod74.ru/images/coin-master-hack-ios-cydia_GM406889139.pdfIn PDF document text
    • http://nod74.ru/images/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://nod74.ru/images/how-to-get-gold-cards-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://nod74.ru/images/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • http://nod74.ru/images/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://nod74.ru/images/roblox-e-free_GM431946152.pdfIn PDF document text
    • http://nod74.ru/images/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://nod74.ru/images/how-to-get-free-spins-grom-coin-master_GM406889139.pdfIn PDF document text
    • http://nod74.ru/images/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://nod74.ru/images/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://nod74.ru/images/minecraft-116-free_GM479516143.pdfIn PDF document text
    • http://nod74.ru/images/free-spin-and-daily-news-coin-master_GM406889139.pdfIn PDF document text
    • http://nod74.ru/images/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://nod74.ru/images/how-to-get-free-spins-on-coin-master-2021-iphone_GM406889139.pdfIn PDF document text
    • http://nod74.ru/images/coin-master-2021-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://nod74.ru/images/free-coin-master-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://nod74.ru/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://nod74.ru/images/coin-master-hack-app-ios-download_GM406889139.pdfIn PDF document text
    • http://nod74.ru/images/wurst-115_GM479516143.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_off000045ea.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x45EA 24412 bytes
SHA-256: 09ef70b47a4829eea3aef6c21c2325a8dd17c3df9c145e0916c3c944fc96147c
font_01_sfnt_off00007dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DFB 17884 bytes
SHA-256: b0210710b9f532dde69bab3e54691bd54d84b0d7d990975f20826afd1ba27450

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