Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcdc9c29a1c6aab9…

MALICIOUS

PDF

42.7 KB Created: 2021-05-14 10:11:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6db48e75d9fb8d6bd22c6044a03051a3 SHA-1: 414dfcf08ef5dbd544be0a30e04654e8422052f3 SHA-256: bcdc9c29a1c6aab9bed70553d23970ef6c763b57672f6eb7055bb192b6b72b10
122 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, identified as a link farm, directing users to external websites. The document body and heuristics suggest a lure related to free spins or game hacks, likely a phishing or scam attempt. The ML classifier strongly indicates maliciousness, and the presence of external URIs points towards the download of a second-stage payload or redirection to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/legit-free-spins-coin-master-game-hack
    • http://www.imperialaccountingfl.com/images/coin-master-email-rewards_GM406889139.pdf
    • http://www.imperialaccountingfl.com/images/minecraft-noob-vs-pro-vs-hacker_GM479516143.pdf
    • http://www.imperialaccountingfl.com/images/daily-free-spins-coin-master-2021_GM406889139.pdf
    • http://www.imperialaccountingfl.com/images/how-to-get-robux-for-free-2021_GM431946152.pdf
    • http://www.imperialaccountingfl.com/images/coin-master-hack-tool-v1-9-pc_GM406889139.pdf
    • http://www.imperialaccountingfl.com/images/coin-master-free-spins-link-download-hack_GM406889139.pdf
    • http://www.imperialaccountingfl.com/images/free-spins-link-in-coin-master-2021_GM406889139.pdf
    • http://www.imperialaccountingfl.com/images/coin-master-free-spins-that-really_GM406889139.pdf
    • http://www.imperialaccountingfl.com/images/how-to-get-free-robux_GM431946152.pdf
    • http://www.imperialaccountingfl.com/images/free-coins_GM406889139.pdf
    • http://www.imperialaccountingfl.com/images/synapse-roblox-free-download_GM431946152.pdf
    • http://www.imperialaccountingfl.com/images/how-to-get-free-robux-on-phone_GM431946152.pdf
    • http://www.imperialaccountingfl.com/images/coin-master-free-spins-and-coins-daily-links_GM406889139.pdf
    • http://www.imperialaccountingfl.com/images/roblox-free-clothes-hack_GM431946152.pdf
    • http://www.imperialaccountingfl.com/images/minecraft-launcher-free_GM479516143.pdf
    • http://www.imperialaccountingfl.com/images/free-coins-coin-master-link-today_GM406889139.pdf
    • http://www.imperialaccountingfl.com/images/websites-that-give-free-robux_GM431946152.pdf
    • http://www.imperialaccountingfl.com/images/free-coin-master-spins-blog_GM406889139.pdf
    • http://www.imperialaccountingfl.com/images/free-rare-cards-for-coin-master_GM406889139.pdf
    • http://www.imperialaccountingfl.com/images/free-robux-websites-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a48.bin
6a059573361b8bb1596bc2daf2da542d9da5bbcd8426a3a1bae209072ada8174		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A48 25892 bytes
font_01_sfnt_off000084dc.bin
0e4f5fc6ff2fec7c34f7a60300b1fa14fa22cd043badad59a9fad54dc28be7cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84DC 18176 bytes

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