Malicious PDF — malware analysis report

Static analysis result for SHA-256 bace38555378e31a…

MALICIOUS

PDF

34.3 KB Created: 2021-07-06 11:58:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 493a17d651945b7617b63bde517dfb0d SHA-1: af57bccdc3876d365fa89c4c698ae4e5fe2b160a SHA-256: bace38555378e31a072e2cb5b8569d80b9a27fd95eae4eb92af53eeac747cd2a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and embedded text promoting free in-game currency and hacks for popular games like Coin Master and Roblox. The primary URL, http://netcdn.tw/app/406889139/free-coin-master-spins-2021-game-hack, is flagged as a malicious redirector, indicating the document's purpose is to lead users to potentially harmful websites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/free-coin-master-spins-2021-game-hack In PDF document text
    • https://www.yantan.com.tw/upload/files/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/free-robux-with-proof_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/coin-master-free-gold-cards_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/roblox-hack-robux-and-tix-download-no-survey_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/coin-master-games-hack_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/free-robux-real-roblox_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/reddit-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/free-robux-master_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/free-roblox-generator_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/coins-master_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/gta-5-roblox-money-hack_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/coin-master-jackpot-madness-hack_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/rbx-claim_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/get-minecraft-windows-10-free_GM479516143.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_002_off000030fa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30FA 22260 bytes
SHA-256: 74ac53e775312ea2e4ae19975b07d0ebbac5ace29ab3d7a52e5cd6ee933602bf
font_01_sfnt_off00006274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6274 18576 bytes
SHA-256: b91ca07aeadef02c4833a5be8b217bc3af90c6c550000b8c217b6d13a7f4cb5d