Malicious PDF — malware analysis report

Static analysis result for SHA-256 81593e3703de620c…

MALICIOUS

PDF

35.7 KB Created: 2021-07-09 19:50:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5976e2c31614130f7ff8a58b36c5c370 SHA-1: 7be8750144819e38ab52a058d46d6d3e4c31c4a4 SHA-256: 81593e3703de620c56224b9e917705d1272cd639e1de2c49774be9539aed80ce
142 Risk Score

Malware Insights

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

The PDF document contains numerous links disguised as generators or hacks for popular games, aiming to trick users into clicking them. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the 'PDF_GAME_HACK_REDIRECT_LURE' specifically identifies the lure. The primary IOC is the redirect URL, which likely leads to a malicious site or further download.

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.
  • 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 http://netcdn.tw/app/431946152/how-to-hack-and-get-free-robux-game-hack PDF link annotation
    • https://and.co.id/assets/CKImages/files/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://and.co.id/assets/CKImages/files/hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • https://and.co.id/assets/CKImages/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://and.co.id/assets/CKImages/files/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • https://and.co.id/assets/CKImages/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://and.co.id/assets/CKImages/files/coin-master-spin-ml_GM406889139.pdfIn PDF document text
    • https://and.co.id/assets/CKImages/files/coin-master-hack-cheat-engine_GM406889139.pdfIn PDF document text
    • https://and.co.id/assets/CKImages/files/free-spins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • https://and.co.id/assets/CKImages/files/minecraft-realms-free-codes_GM479516143.pdfIn PDF document text
    • https://and.co.id/assets/CKImages/files/hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • https://and.co.id/assets/CKImages/files/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://and.co.id/assets/CKImages/files/links-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://and.co.id/assets/CKImages/files/free-roblox-executor_GM431946152.pdfIn PDF document text
    • https://and.co.id/assets/CKImages/files/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://and.co.id/assets/CKImages/files/free-redeem-code-for-coin-master_GM406889139.pdfIn PDF document text
    • https://and.co.id/assets/CKImages/files/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • https://and.co.id/assets/CKImages/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://and.co.id/assets/CKImages/files/try-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://and.co.id/assets/CKImages/files/how-do-you-earn-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://and.co.id/assets/CKImages/files/apps-that-give-you-free-robux_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_off000032a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32A4 22872 bytes
SHA-256: 70ae6540ecba12e407e6f39c3af56a2682807f8e9d4472c4581399b8ce214bb8
font_01_sfnt_off000065d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65D5 19328 bytes
SHA-256: 38bb1ef0d1232593bc33faeb07ab7c9da97d5775ca686b5d0190a8681bcdbe68

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