Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd6d3c8bfc45a9a…

MALICIOUS

PDF

45.9 KB Created: 2021-05-11 06:31:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b753167c7e31bbeb5ed4842f11f5c519 SHA-1: 653196592743c9610b411e3720fd0492c99a8cc3 SHA-256: 5bd6d3c8bfc45a9a6108e219862fe2fe454aaefdae89c9643fcdb40cfb23e5a2
142 Risk Score

Malware Insights

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

The PDF document contains multiple external links, including one to a 'free generator / game hack' lure, and exhibits characteristics of a link farm. The primary purpose appears to be directing users to external sites, potentially for SEO manipulation or to host further malicious content. While no scripts were explicitly extracted, the nature of the links and the heuristic firings suggest a malicious workflow, likely involving user interaction to navigate to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/free-spin-and-win-coin-master-game-hack PDF link annotation
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/hack-card-collection-coin-master_GM406889139.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/coinmaster-fan-page_GM406889139.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/coin-master-free-spins-and-coins-group_GM406889139.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/free-robux-app_GM431946152.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/robux-claimer_GM431946152.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/hack-to-send-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/daily-free-spin-link-in-coin-master_GM406889139.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/minecraft-classic-free_GM479516143.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-2021_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
stream_003_off00004ec2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EC2 24400 bytes
SHA-256: 863bbb3233ca467d97ff583bc7a4c86dc9e53b0861aa002a37d5f4c7ccd455e1
font_01_sfnt_off0000869d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x869D 3000 bytes
SHA-256: 2dc442bec2876772b2b8d4b50a4abf064217aa7912c99c219d8694ed3db7bda1
font_02_sfnt_off000090fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90FD 18256 bytes
SHA-256: 9a1b20d80f3e4f809c9a9d9b8851ebdec2d0bde394b804bfd21e1aa58c8059b7

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