Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcda3a8096684533…

MALICIOUS

PDF

41.4 KB Created: 2021-05-16 13:57:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 96afaa0a9edcba25550aaf71384c62aa SHA-1: 3d9abb1e6189237068fa4f2cbf63fed6672557ca SHA-256: bcda3a8096684533cdd933ef0d7f02c0b7d71283c75826a06f7ea9589ea536fe
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links, with a primary URL pointing to a 'coin master free spins link' lure. This heuristic, combined with the ML classifier flagging the PDF as malicious, strongly suggests a phishing or scam attempt. Although no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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-spins-link-2021-app-game-hack PDF link annotation
    • https://www.les-sp.org/images/how-to-get-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.les-sp.org/images/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.les-sp.org/images/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://www.les-sp.org/images/can-lucky-patcher-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.les-sp.org/images/robuxmatchcon_GM431946152.pdfIn PDF document text
    • https://www.les-sp.org/images/coin-master-online-free-spin_GM406889139.pdfIn PDF document text
    • https://www.les-sp.org/images/coin-master-free-pin_GM406889139.pdfIn PDF document text
    • https://www.les-sp.org/images/robux-free-com_GM431946152.pdfIn PDF document text
    • https://www.les-sp.org/images/coin-mast-hacks_GM406889139.pdfIn PDF document text
    • https://www.les-sp.org/images/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • https://www.les-sp.org/images/instagram-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.les-sp.org/images/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • https://www.les-sp.org/images/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • https://www.les-sp.org/images/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • https://www.les-sp.org/images/how-to-get-free-clothes-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.les-sp.org/images/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://www.les-sp.org/images/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.les-sp.org/images/coin-master-hack-apk-facebook-login_GM406889139.pdfIn PDF document text
    • https://www.les-sp.org/images/optifine-pe_GM479516143.pdfIn PDF document text
    • https://www.les-sp.org/images/robux-free-gift-card_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_003_off0000467f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x467F 24536 bytes
SHA-256: 42dbe1d1c9345d5e35f1d0560ce6e7fb8eb7b4bb5559a9b7db655acc78dfde57
font_01_sfnt_off00007edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EDC 18456 bytes
SHA-256: 167b39d3647e498e0ec03b327af8990ef16421e892c116ed7416f41c48696d06

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