Malicious PDF — malware analysis report

Static analysis result for SHA-256 457554e77ae17a6b…

MALICIOUS

PDF

45.1 KB Created: 2021-05-11 04:31:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 38c778a8a1dc1cf51fbf94260950e44b SHA-1: 1af74d35a2bcaf9a2c8cac2c6fe39892efe817d0 SHA-256: 457554e77ae17a6b4633e0fb167cc1c7e35bdce67f98ef42828d5aaed3b3000c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, identified as a 'link farm' by heuristics, pointing to websites offering game hacks and free currency. The primary lure URL is https://netcdn.xyz/app/406889139/coin-master-free-spin-bonus-game-hack. While no scripts were extracted, the PDF structure and embedded links strongly suggest a social engineering tactic to redirect users to potentially malicious or scam-related content, likely distributed as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

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/406889139/coin-master-free-spin-bonus-game-hack PDF link annotation
    • http://elearning.mtsn2skh.sch.id/__statics/gudangsoal/files/coin-master-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2skh.sch.id/__statics/gudangsoal/files/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2skh.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2skh.sch.id/__statics/gudangsoal/files/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2skh.sch.id/__statics/gudangsoal/files/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2skh.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2skh.sch.id/__statics/gudangsoal/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2skh.sch.id/__statics/gudangsoal/files/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn2skh.sch.id/__statics/gudangsoal/files/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2skh.sch.id/__statics/gudangsoal/files/coin-master-offline-hack_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2skh.sch.id/__statics/gudangsoal/files/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn2skh.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2skh.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2skh.sch.id/__statics/gudangsoal/files/coin-master-latest-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2skh.sch.id/__statics/gudangsoal/files/coin-master-free-spins-app-android_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2skh.sch.id/__statics/gudangsoal/files/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2skh.sch.id/__statics/gudangsoal/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2skh.sch.id/__statics/gudangsoal/files/mistplay-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2skh.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2skh.sch.id/__statics/gudangsoal/files/free-roblox-accounts-with-robux-2021_GM431946152.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_003_off00004ad4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AD4 25368 bytes
SHA-256: b84420ad59fba23f240f092501f4964b27c5c885603aa340f2b96a41bca97850
font_01_sfnt_off000083db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83DB 2944 bytes
SHA-256: fcfcd28869b8d6c7503d63ed8d48371ec5b580fea2733193e2acbb82b3d30a76
font_02_sfnt_off00008e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E06 18240 bytes
SHA-256: 56cae26c9e1a4b5919af4eab4714cc1a0c8bc5c343e04c4cbd8c5d1e26baf8dd

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