Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83e02b421b862e4…

MALICIOUS

PDF

47.4 KB Created: 2021-06-09 13:47:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9715026335ed9e26fa4807a0528d32bc SHA-1: 1ebfd4d2c3fd44a4cfa8894c94901c6f40e410d9 SHA-256: d83e02b421b862e45249ceb4375303b511e7331c021539bea8e9b77cec7a5d6f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a high number of external links, many of which are disguised as game hacks or generators, indicating a link farm or SEO manipulation tactic. One prominent link redirects to a page that itself hosts numerous other PDF links. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/getting-robux-with-cheat-engine-game-hack PDF link annotation
    • https://elearning.mtsn4jembrana.sch.id/__statics/gudangsoal/files/cmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn4jembrana.sch.id/__statics/gudangsoal/files/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn4jembrana.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn4jembrana.sch.id/__statics/gudangsoal/files/coin-master-free-spins-daily-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn4jembrana.sch.id/__statics/gudangsoal/files/free-roblox-toy-codes_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn4jembrana.sch.id/__statics/gudangsoal/files/coin-master-code-for-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn4jembrana.sch.id/__statics/gudangsoal/files/get-free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn4jembrana.sch.id/__statics/gudangsoal/files/coin-master-32-android-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn4jembrana.sch.id/__statics/gudangsoal/files/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn4jembrana.sch.id/__statics/gudangsoal/files/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn4jembrana.sch.id/__statics/gudangsoal/files/roblox-gift-card-free-codes_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn4jembrana.sch.id/__statics/gudangsoal/files/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn4jembrana.sch.id/__statics/gudangsoal/files/free-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn4jembrana.sch.id/__statics/gudangsoal/files/tiktok-free-no-sign-in_GM835599320.pdfIn PDF document text
    • https://elearning.mtsn4jembrana.sch.id/__statics/gudangsoal/files/https-iosgodscom-topic-20214coinmasterhack_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn4jembrana.sch.id/__statics/gudangsoal/files/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn4jembrana.sch.id/__statics/gudangsoal/files/coin-master-hack-1021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn4jembrana.sch.id/__statics/gudangsoal/files/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn4jembrana.sch.id/__statics/gudangsoal/files/wurst-commands_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn4jembrana.sch.id/__statics/gudangsoal/files/coin-master-levels_GM406889139.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_off000052f7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52F7 28792 bytes
SHA-256: 98d7e0ff9c94b20cb846d3074c9a8ee75fb1e2832297757fdeec59a7bd75cf17
font_01_sfnt_off000094d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94D5 18956 bytes
SHA-256: b8003188fdcd474dfcc2be82a50abd7d939ff1da70fabccaea4aa22b3ce9232f

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