Malicious PDF — malware analysis report

Static analysis result for SHA-256 db78470c8769a380…

MALICIOUS

PDF

44.9 KB Created: 2021-06-07 10:02:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e583c8e47dbe11993771a19aaae18013 SHA-1: 79146bbe49d3a021d9365c96a69e7d8ccb801d0f SHA-256: db78470c8769a380ea26083863db9f64131e76308e28ce63c355fcf14ec5d593
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, disguised as 'free generator' or 'game hack' lures. The primary redirector URL is https://netcdn.tw/app/431946152/roblox-games-to-play-online-for-free-game-hack. The document body and embedded links suggest a social engineering attempt to trick users into visiting these malicious sites, likely leading to further malware downloads or phishing attempts. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/roblox-games-to-play-online-for-free-game-hack In PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/scaffold-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/easy-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/how-to-buy-pubg-uc-for-free_GM1330123889.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/minecraft-linux-free_GM479516143.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/coinmaster-spin-ml-link_GM406889139.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/roblox-but_GM431946152.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/download-hacked-games-coin-master_GM406889139.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/free-roblox-card_GM431946152.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/coin-master-free-spin-bonus_GM406889139.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/get-free-robux-com_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_004_off00004f46.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F46 25720 bytes
SHA-256: e6b7c3c51d03086ef8e8b08229fa6bc69f662d79fe5fdd67c6ae086cbca17861
font_01_sfnt_off00008b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B72 18892 bytes
SHA-256: fe3b37e9a5bb998243d0d67cab1b4e541f5876551b545b614b348762394c6437

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