Malicious PDF — malware analysis report

Static analysis result for SHA-256 e98b98a1cf29becc…

MALICIOUS

PDF

43.6 KB Created: 2021-05-19 23:37:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4c9901ff2150ccbf1a3689cf5fecb7cc SHA-1: 5aa3d68476b5d319b2b4d4fc497073b341dc190f SHA-256: e98b98a1cf29beccc6a62f7a8af9129b8c5066e58040e2911919c595cfd6c06b
122 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many of which are presented as 'PDF link farms' and advertise game hacks and vouchers. The ML classifier strongly indicated maliciousness, and the presence of these links suggests an attempt to direct users to download potentially harmful content. The document body itself contains obfuscated text and URLs, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/1330123889/pubg-uc-voucher-game-hack
    • http://www.3d-gold.com.hk/upload/files/hack-coin-master-android-2021_GM406889139.pdf
    • http://www.3d-gold.com.hk/upload/files/coin-master-hack-8-ball-pool_GM406889139.pdf
    • http://www.3d-gold.com.hk/upload/files/free-spins-on-coin-master-link_GM406889139.pdf
    • http://www.3d-gold.com.hk/upload/files/free-minecraft-texture-packs-java_GM479516143.pdf
    • http://www.3d-gold.com.hk/upload/files/free-coins-and-free-spins-coin-master-2021_GM406889139.pdf
    • http://www.3d-gold.com.hk/upload/files/minecraft-bedrock-edition-free-with-java_GM479516143.pdf
    • http://www.3d-gold.com.hk/upload/files/minecraft-free-download-unblocked_GM479516143.pdf
    • http://www.3d-gold.com.hk/upload/files/real-working-coin-master-hack_GM406889139.pdf
    • http://www.3d-gold.com.hk/upload/files/free-spin-link-coin-master-today_GM406889139.pdf
    • http://www.3d-gold.com.hk/upload/files/how-to-hack-someones-roblox-account-2021_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/minecraft-for-free-on-phone_GM479516143.pdf
    • http://www.3d-gold.com.hk/upload/files/minecraft-windows-10-free_GM479516143.pdf
    • http://www.3d-gold.com.hk/upload/files/how-to-gain-more-spins-on-coin-master-for-free_GM406889139.pdf
    • http://www.3d-gold.com.hk/upload/files/free-robux-no-gift-card_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/coin-master-apk-hack-358_GM406889139.pdf
    • http://www.3d-gold.com.hk/upload/files/free-robux-website_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/how-to-get-free-robux-on-mobile_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/free-coin-master-spins-without-human-verification_GM406889139.pdf
    • http://www.3d-gold.com.hk/upload/files/legit-coin-master-hack-without-verification_GM406889139.pdf
    • http://www.3d-gold.com.hk/upload/files/minecraft-nintendo-switch-digital-code-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004cfb.bin
32e92bb1238ff1b95a4aaebeb5c252ba9bb383c4d76caab1ca14be0646802bd3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CFB 25488 bytes
font_01_sfnt_off00008834.bin
10db02f4b1401a5dd02a22f084e9f7057729daa9d790706f9921932124bfe87a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8834 18340 bytes

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