Malicious PDF — malware analysis report

Static analysis result for SHA-256 4314fddeb85f1d35…

MALICIOUS

PDF

34.3 KB Created: 2021-06-25 14:38:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9c90c2510e341ce6198333933d671dc2 SHA-1: c114e724c297a8564b7edc7f5277b58defd297b1 SHA-256: 4314fddeb85f1d35e6d0cce5c19c38798f5133c5962f090571592045af85efae
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 are related to game hacks and free in-game currency, suggesting a lure for users to download potentially malicious content. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a "download button" heuristic further supports the malicious intent of directing users to external resources.

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 http://netcdn.co/app/431946152/half-hacker-half-guest-roblox-game-hack PDF link annotation
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/how-to-get-free-hair-roblox_GM431946152.pdfIn PDF document text
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/ldshadowlady-roblox-someone-hacked-my-acount_GM431946152.pdfIn PDF document text
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/best-sites-for-free-robux_GM431946152.pdfIn PDF document text
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/how-to-get-free-tiktok-fans-without-human-verification_GM835599320.pdfIn PDF document text
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-a-phone-easy_GM431946152.pdfIn PDF document text
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/hex-roblox-hack_GM431946152.pdfIn PDF document text
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/roblox-vampire-hunters-2-credit-hack_GM431946152.pdfIn PDF document text
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/free-gear-codes-for-roblox_GM431946152.pdfIn PDF document text
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/free-robux-admin-command_GM431946152.pdfIn PDF document text
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/hack-ed-roblox_GM431946152.pdfIn PDF document text
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/arsenal-hacks-roblox-2021_GM431946152.pdfIn PDF document text
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/cheat-engine-for-roblox-apocalypse-rising_GM431946152.pdfIn PDF document text
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/how-too-hack-roblox-carlos-amin-house_GM431946152.pdfIn PDF document text
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/roblox-free-game-no-download_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30B9 21972 bytes
SHA-256: 6a8ce0cdea09647ac45bb62fc1b4c66c36daff103c4bb17c5f5963738e7d35e6
font_01_sfnt_off0000611a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x611A 18900 bytes
SHA-256: d66b8b2d60d7cb213164c30aa8f89c39dc045b6eb47fe548f7ce19d19f3456d9

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