Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d8132052262f4a…

MALICIOUS

PDF

33.9 KB Created: 2021-07-06 16:33:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c3ef7634e14c710273695007f488a1bf SHA-1: 23873678ef85fea6e3f30f0f6c3041ad099a85bf SHA-256: 84d8132052262f4ad4d219baf26604443cad3c0279b5efc3a951ce77e1c245de
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs and a link farm, strongly suggesting a phishing or scam attempt. The document body and extracted URLs explicitly mention 'hacks', 'free coins', and 'free spins' for games like Coin Master and Roblox, indicating a lure to download potentially malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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
  • 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 http://netcdn.tw/app/406889139/2021-coin-master-hack-game-hack PDF link annotation
    • http://www.sovtigaz.ru/f/files/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/how-to-hack-any-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/roblox-muscle-legends-cheat_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/coin-master-free-download-app_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/roblox-free-clothes-catalog_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/free-roblox-accounts-no-robux_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/robloxgamehackonline-verification-problem_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/how-to-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/robux-free-unlimited_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/free-roblox-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/how-to-get-minecraft-for-free-on-android_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
font_00_sfnt_off00002eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EDA 22496 bytes
SHA-256: 631ceee230d4cf51bbca848c3dd5e02c14c1d019810e18934dc1ca7dfe0e6f36
font_01_sfnt_off00006125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6125 18408 bytes
SHA-256: 757a300da21b326d8daac5a2642b0229b94aaf5c61a40aba9c419461a931f419