Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c0936735a55d5c3…

MALICIOUS

PDF

51.9 KB Created: 2021-05-14 23:55:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 64a2fc66b535ed3c922f095f01f594ac SHA-1: 836ae4ed32d0062cffe758fe5cbcd23d19cb6b48 SHA-256: 9c0936735a55d5c3dab0b3f07c876231afa7d52b573dd7f7a9e4bc8026081844
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, including one that appears to be a "free generator / game hack" lure. The document body, though heavily obfuscated, contains references to similar lures and URLs. The primary function of this document is to redirect users to malicious sites, likely to download further malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8646

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/hack-coin-master-apk-mod-game-hack In PDF document text
    • https://brainpads.com/images/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/coin-master-hack-download-2021_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/coin-master-free-spins-2-5-2021_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/coin-master-ultra-attack-hack_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/coin-master-facebook-hack_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/coin-master-free-spins-link-download-ios_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/clean-master-hack-coins_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/coin-master-exchange-40-free-spins_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/robux-for-offers_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/is-roblox-free-on-nintendo-switch_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/coin-master-free-download_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/coin-master-game-hack-kaise-kare_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ac1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AC1 30244 bytes
SHA-256: c64ff5f42bc8d1395d82885063e05f76d60166127045dff769b8369f87d7545f
font_01_sfnt_off00008cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB7 2980 bytes
SHA-256: 7759d00b2b93864c79bc0fca70ffdcdc34d821ecd92b660f9baf4d82407f8209
font_02_sfnt_off00009705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9705 7332 bytes
SHA-256: d811e0aca85f3b94c42cd1240eec68b8eb378f3d8be5e408d3f6abd0f11f834d
font_03_sfnt_off0000a91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA91E 18068 bytes
SHA-256: 9a1fe8593802629ca91e824aef9790fcb981ac5ee6ac3e1bb8e6d1b292261c5d

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