Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22e51f5f78635d0…

MALICIOUS

PDF

48.0 KB Created: 2021-06-07 04:11:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4c835a75661744a1588c82158cab62ad SHA-1: c94b15c2f1990b003c32a519b9b0464d70041f34 SHA-256: b22e51f5f78635d036c801b5950030274004b26bde0d6857204ef504cb4c2f27
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as 'free generator' or 'game hack' lures. The primary link directs users to 'https://netcdn.tw/app/431946152/free-robux-codes-that-work-2021-game-hack', which is likely intended to lead to a further malicious download or exploit. The presence of these lures and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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.tw/app/431946152/free-robux-codes-that-work-2021-game-hack In PDF document text
    • http://apotema.com.co/ufiles/files/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/hacked-client-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/coin-master-hacks-to-get-spins_GM406889139.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/roblox-free-pants_GM431946152.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/get-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/if-i-uninstall-minecraft-can-i-reinstall-it-for-free_GM479516143.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/www-free-robux_GM431946152.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/pubg-600-uc-redeem-code_GM1330123889.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/coin-master-hack-apk-link_GM406889139.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/coin-master-hack-game-download-ios_GM406889139.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/rich-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/coin-master-unlimited-spin-and-coin-hack_GM406889139.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/coin-master-free-spin-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/coin-master-free-spins-without-verification_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 6

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005400.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5400 28708 bytes
SHA-256: 00878701b13071e7e95d90395fff932ad5d726416eb0f87a0683693c622e7ce6
font_01_sfnt_off000095ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95AD 19456 bytes
SHA-256: 0a0d8ea1dfe2aa9f358690b53868fa7e53288d9dc258c1422d96709423693ae0

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