Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18208c17075a461…

MALICIOUS

PDF

34.6 KB Created: 2021-07-06 07:24:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 038b8f92fc943a4eccd691be5eac2b26 SHA-1: 96699f5e3b3a985b8f4caa1b84a6d18367289b72 SHA-256: e18208c17075a4617a88f1ca0140395f24c65abfd527f156d2b17e59143644c3
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 0.9980

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/406889139/coin-master-hack-ios-10-game-hack PDF link annotation
    • http://lib.teknik.unimal.ac.id//repository/coin-master-hack-ios-reddit_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/get-free-robux-daily_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/can-you-really-hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/claimrbx-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/online-coin-master-free-spin-app_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-know-if-someone-is-hacking-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/codes-to-enter-for-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/minecraft-115-2-hacks_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-free-spins-android_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-35-16-hack-apk_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/get-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-hack-mui-dragon-ball-rp-no-robux_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-robux-no-human-verification-2021-no-download_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/coin-master-working-hack_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/what-games-give-you-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_off000031c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C1 22616 bytes
SHA-256: 8a540d593d384b0bf8941bf38e3cd68412b6488093651e786b26e0cd4cd2c69e
font_01_sfnt_off00006455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6455 18280 bytes
SHA-256: 3e79d4936d888b4ad4fc5a43c908061d2107cf37f241411488affe22978c914d

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