Malicious PDF — malware analysis report

Static analysis result for SHA-256 776a359ad37bf1e4…

MALICIOUS

PDF

48.5 KB Created: 2021-06-10 13:51:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: bd359e757fa85357f59fcf91e709a6c9 SHA-1: 738488d6b7aded99b9b991561c3afbba61d1433f SHA-256: 776a359ad37bf1e4e2380bce0c9fd0dc839c03f487d033b8495d8f0970485f5a
122 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are structured as SEO link farms, suggesting a malicious intent to drive traffic to potentially harmful content. The document body and extracted URLs focus on 'free Robux' and game hacks, a common lure for phishing or malware distribution. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.tw/app/431946152/how-to-get-free-robux-no-hack-2021-game-hack
    • http://wwlogistic.net/uploaded_files/userfiles/files/is-roblox-hacked_GM431946152.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/coin-master-gold-cards-free_GM406889139.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/hack-coin-master-apk-ios_GM406889139.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/how-to-get-robux-on-phone_GM431946152.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/free-coin-master-spin-app_GM406889139.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/easy-robux-generator_GM431946152.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/free-robux-without-downloading-anything_GM431946152.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/robux-cheat-engine-66_GM431946152.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/woman-roblox_GM431946152.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/minecraft-pe-015-0-apk-free-download_GM479516143.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/free-roblox-girl-hair-not-a-model_GM431946152.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/good-free-minecraft-server-hosting_GM479516143.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/coin-master-spin-ml-link_GM406889139.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/robux-earning-sites_GM431946152.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/fbchampion_GM406889139.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/how-to-get-minecraft-java-for-free_GM479516143.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/lazyblox-com-free-robux_GM431946152.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/how-to-hack-to-get-robux_GM431946152.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/get-follower-tiktok-free_GM835599320.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051b7.bin
af1fe48d4d617c4fa8532c32a5380f71265b972ac60e0817a1b09c9002b96579		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51B7 25152 bytes
font_01_sfnt_off00008bc4.bin
9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC4 5596 bytes
font_02_sfnt_off0000986c.bin
7a372780d515ee2350df34a2483a7bd0b44043396199888d7c3c3e021af6f820		 pdf-font-stream PDF embedded font (sfnt) at offset 0x986C 19084 bytes

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