Malicious PDF — malware analysis report

Static analysis result for SHA-256 6115a5e68224b8bf…

MALICIOUS

PDF

47.2 KB Created: 2021-05-15 02:15:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3bfc35a9117c50886089b91cb0ebdbc7 SHA-1: 8dbb534e2566428a79f88de77959a343f960cac2 SHA-256: 6115a5e68224b8bf682172d204e1b36729025d336ad1ad746fba63e5f0733b40
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URIs pointing to other PDF files hosted on an IP address, designed to appear as "hacks" for games like Coin Master and Roblox. This indicates a link farm strategy to distribute further malicious content. The presence of a download button lure and callback phishing lure, combined with the ML classifier flagging the PDF as malicious, strongly suggests a phishing or scam campaign aimed at tricking users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 6

  • 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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/coin-master-3.4-4-hack-game-hack
    • http://118.174.0.244/UserFiles/File/get-free-coins-for-coin-master_GM406889139.pdf
    • http://118.174.0.244/UserFiles/File/se-puede-hackear-coin-master_GM406889139.pdf
    • http://118.174.0.244/UserFiles/File/robux-download_GM431946152.pdf
    • http://118.174.0.244/UserFiles/File/roblox-hack-com_GM431946152.pdf
    • http://118.174.0.244/UserFiles/File/minecraft-xray-hack_GM479516143.pdf
    • http://118.174.0.244/UserFiles/File/roblox-tracker_GM431946152.pdf
    • http://118.174.0.244/UserFiles/File/how-to-get-free-robux-codes-2021_GM431946152.pdf
    • http://118.174.0.244/UserFiles/File/card-hack-in-coin-master_GM406889139.pdf
    • http://118.174.0.244/UserFiles/File/how-to-get-free-robux-without-paying_GM431946152.pdf
    • http://118.174.0.244/UserFiles/File/coin-master-free-spins-link_GM406889139.pdf
    • http://118.174.0.244/UserFiles/File/how-to-hack-roblox-accounts-on-phone_GM431946152.pdf
    • http://118.174.0.244/UserFiles/File/free-robux-hack-no-human-verification_GM431946152.pdf
    • http://118.174.0.244/UserFiles/File/how-to-get-free-robux-on-pc_GM431946152.pdf
    • http://118.174.0.244/UserFiles/File/minecraft-gun-mod-download-free_GM479516143.pdf
    • http://118.174.0.244/UserFiles/File/free-spins-coin-master-facebook_GM406889139.pdf
    • http://118.174.0.244/UserFiles/File/haktutsin-2021-09-coinmaster50freespinandcoinlinkhtml-m-1_GM406889139.pdf
    • http://118.174.0.244/UserFiles/File/coin-master-daily-free-spins-link-march-2021_GM406889139.pdf
    • http://118.174.0.244/UserFiles/File/moonactive-free-spins_GM406889139.pdf
    • http://118.174.0.244/UserFiles/File/stock-speed-coin-master-free-spins_GM406889139.pdf
    • http://118.174.0.244/UserFiles/File/how-to-get-free-robux-without-verifying_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004afd.bin
d713c3e14d703d9e69cc39da5a12560df297a087e4724807f3a07e7a2ff60978		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AFD 24196 bytes
font_01_sfnt_off00008258.bin
e06aca5f85e50ae6cefda302c5299c18ab6d27c174f74f0bb0ee8efa7ccb4468		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8258 8676 bytes
font_02_sfnt_off000096e2.bin
12637fa898f8f880bac236962200324c713a71a6487c0e268acaa96303f78b9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96E2 18016 bytes

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