Malicious PDF — malware analysis report

Static analysis result for SHA-256 172b47e6f749f194…

MALICIOUS

PDF

44.6 KB Created: 2021-05-14 22:45:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 27c17342a2c4954d299fe443d4fc0a0d SHA-1: 1b40b905fba938f30a3f18de3227517619fd7682 SHA-256: 172b47e6f749f194ab7007e2b103aff2f5bd5a7f0c9c0e7a21d9a8a4e45e29ca
122 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to websites offering game hacks or free in-game currency. The document body and extracted URLs strongly suggest a phishing or scam attempt to lure users to these sites. 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 https://netcdn.xyz/app/431946152/free-account-roblox-with-robux-game-hack
    • https://masseymotorcars.com/images/how-can-i-get-robux_GM431946152.pdf
    • https://masseymotorcars.com/images/how-to-hack-a-minecraft-server_GM479516143.pdf
    • https://masseymotorcars.com/images/coin-master-hack-8-ball-pool_GM406889139.pdf
    • https://masseymotorcars.com/images/coin-master-free-spins-link-blogspot_GM406889139.pdf
    • https://masseymotorcars.com/images/coin-master-free-daily-spins-and-coins_GM406889139.pdf
    • https://masseymotorcars.com/images/claimrbx-free-robux_GM431946152.pdf
    • https://masseymotorcars.com/images/roblox-promo-codes-free-robux_GM431946152.pdf
    • https://masseymotorcars.com/images/coin-master-play-online-free_GM406889139.pdf
    • https://masseymotorcars.com/images/free-robux-codes-no-verification-2021_GM431946152.pdf
    • https://masseymotorcars.com/images/how-to-get-free-spins-on-coin-master-2021-links_GM406889139.pdf
    • https://masseymotorcars.com/images/coin-master-free-spins-link_GM406889139.pdf
    • https://masseymotorcars.com/images/2021-roblox_GM431946152.pdf
    • https://masseymotorcars.com/images/coin-master-mod-apk-free-download_GM406889139.pdf
    • https://masseymotorcars.com/images/legit-coin-master-hack_GM406889139.pdf
    • https://masseymotorcars.com/images/free-robux-group_GM431946152.pdf
    • https://masseymotorcars.com/images/hack-robux_GM431946152.pdf
    • https://masseymotorcars.com/images/www-free-robux_GM431946152.pdf
    • https://masseymotorcars.com/images/free-coin-master-spins-for-today_GM406889139.pdf
    • https://masseymotorcars.com/images/free-roblox-promo-codes-for-robux_GM431946152.pdf
    • https://masseymotorcars.com/images/free-robux-just-enter-username_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b63.bin
e290c3d924c21924499c34cd8118aa0cf7b0ce8e1f781325c144a873877e9d65
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B63 27548 bytes
font_01_sfnt_off00008aff.bin
668999cf9284642de193c24d0ad86807d097fd3a0f3919542938043f8a05e142
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AFF 18676 bytes