Malicious PDF — malware analysis report

Static analysis result for SHA-256 3720d55edf0266ff…

MALICIOUS

PDF

44.9 KB Created: 2021-05-12 20:13:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 17feadd69fbfc3f69cd196fd85572415 SHA-1: 14454dae00e7d4d29cbe3471d8d029fee4140445 SHA-256: 3720d55edf0266ff4d75c8b6ea861ef49e4b30263974d0c194211602e20eb985
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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/blox-best-robux-game-hack PDF link annotation
    • http://ratchadatitan.com/UserFiles/File/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/coin-master-free-spins-iphone-2021_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/mcpe-master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/como-hackear-coin-master-gratis_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/coin-master-free-spins-today-39_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/how-do-you-earn-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/how-to-get-roblox-money_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b5d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B5D 24504 bytes
SHA-256: 48a50600ceef2642d5b67250259cb369ada37ad9aa1d5bb8466da5dd634a0d01
font_01_sfnt_off00008341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8341 2956 bytes
SHA-256: bab8933fc39dc331bc4c1c904a82b1432ab2e02478fa0a59453c98c5c231da8d
font_02_sfnt_off00008d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D61 18028 bytes
SHA-256: c8ab82621ec7f064c11414a5e1a29f386e261b50dcc0eed2286f6c560c7e59c4

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