Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8f979f8a6ee162…

MALICIOUS

PDF

48.5 KB Created: 2021-06-03 06:02:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1a6b200c1ffdd6a3fffe9652e2222990 SHA-1: aafa4ceba53d2d72d30ff609a02b22003a46940c SHA-256: 0a8f979f8a6ee162f9949d3a3772a837e57ef5aadbcd741253db2e5882b59f7b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. 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 0.9796

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.
  • 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.
  • 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.online/app/406889139/coinmaster-free-cards-game-hack PDF link annotation
    • https://pustaka.stie-pembangunan.ac.id/repository/coin-master-hack-cheat-engine_GM406889139.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/minecraft-games-online-free-no-download_GM479516143.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/coin-master-spins-gratis_GM406889139.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/coin-master-free-link-daily_GM406889139.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/hack-to-protect-village-on-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/minecraft-free-download-android-apk_GM479516143.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/toolbox-for-minecraft-ios_GM479516143.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/tiktok-followers-for-free_GM835599320.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/coin-master-ios-hack_GM406889139.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/coin-master-hack-unlimited-spins-and-coins-cheats_GM406889139.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/minecraft-free-version_GM479516143.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/hacks-for-minecraft-bedrock_GM479516143.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_004_off000052e7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52E7 27004 bytes
SHA-256: 02dcebed7b3400ff9b1b15272959ddab703b75d519a6dff4862fb6185096730f
font_01_sfnt_off000091cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91CC 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off00009b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B7F 18144 bytes
SHA-256: 4e9ac2dffccf12dc152d767ce3e4837f7e1c2082475e153b18622bd7e6b7030e

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