Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f51e03d4ac7335…

MALICIOUS

PDF

44.0 KB Created: 2021-05-10 17:11:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: a80e53e00f0163b0f2ac9d1883ec7d6d SHA-1: 7d347a3b53321efa96e5f8bdb6cf1ee5939ae44b SHA-256: d6f51e03d4ac73356a94a93d12987f9fd958c8ed955ea80f5bf00d55224d141c
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 0.9648

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/roblox-but-game-hack PDF link annotation
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/free-coin-master-s_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/coin-master-hack-online-android_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/can-you-earn-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/how-to-get-free-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/coin-master-hack-without-verification-code-2021_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/robux-redeem_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/hack-the-coin-master-game_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/how-to-get-free-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/coin-master-facebook-hack_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/coin-master-free-spins-promo-code_GM406889139.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
font_00_sfnt_off00004784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4784 25072 bytes
SHA-256: ec742b4033747c1e3ee40d9c7a171b42edfe597b65bce9ecc3e675b67160f4b2
font_01_sfnt_off00007f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F53 3084 bytes
SHA-256: 4889dc98a6bfd3c9244583f92387be58625a91e7a969778ad35ada89b27ed636
font_02_sfnt_off000089f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89F9 18028 bytes
SHA-256: fce4ff27a020ad9ba149cc73b7458b992072ea6f25dbf5cf8584b9a1203412e3

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