Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6eb420bbe551f13…

MALICIOUS

PDF

45.3 KB Created: 2021-06-08 18:01:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 392a727f9eb0481789c13ec70698ced1 SHA-1: ee988fbb01638d46ac7f483a9836beff87e27484 SHA-256: f6eb420bbe551f13bff9b2160ee3365622a7d17b8740b2df7e708ae19fa98953
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including one identified as a malicious redirector, disguised as game hack generators. The document body and heuristic firings strongly suggest a lure to trick users into visiting these sites, which likely host further malicious content or facilitate downloads. No scripts were extracted, but the embedded URLs and redirector heuristic are high-confidence indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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.tw/app/431946152/how-to-hack-roblox-june-2021-game-hack In PDF document text
    • https://kierowcyhgv.uk/images/coin-master-60-spins_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/minecraft-net-free_GM479516143.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/roblox-fun-robux_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/links-to-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/buy-robux-free_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/pubg-300-uc-price-in-india_GM1330123889.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/minecraft-java-edition-free-download-for-android_GM479516143.pdfIn PDF document text
    • http://kierowcyhgv.uk/images/how-to-get-free-robux-on-phone-no-download_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/coin-master-daily-free-spins-link-today-2021-free_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/roblox-land-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
stream_004_off0000512a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x512A 25524 bytes
SHA-256: 046371e36cf115683d70d5be523c80473cd1861506359045ed140eff4f020316
font_01_sfnt_off00008bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD2 19056 bytes
SHA-256: ed61f4f95fd85cedd557233ea2c46db0c389abc1e359abf7127d693a8526af34

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