Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c40a1b621bf8083…

MALICIOUS

PDF

33.9 KB Created: 2021-07-08 08:19:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: aee0c952cca198f18a2808b0eae1f8bc SHA-1: 46f1a149f4638b0a4483a05d9aa61a8c6136fb42 SHA-256: 4c40a1b621bf80835621cb2ecddc059580ab6672d8fe7b258eff7bd0b216dbd6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links to known malicious redirectors and game hack lures, specifically targeting popular games like Roblox. The primary link, http://netcdn.tw/app/431946152/robux-website-game-hack, is identified as a malicious redirector. The document body, though partially corrupted, contains references to game hacks and URLs, reinforcing the lure. No scripts were extracted, but the embedded links strongly suggest a phishing or malware distribution attempt.

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/431946152/robux-website-game-hack In PDF document text
    • https://www.tena-g.hr/files/can-pokemon-go-free-promo-codes_GM1094591345.pdfIn PDF document text
    • https://tena-g.hr/files/lifting-simulator-roblox-cheat_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/roblox-generator_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/minecraft-free-edition_GM479516143.pdfIn PDF document text
    • https://tena-g.hr/files/www-coinmaster_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-skin-strucid-roblox_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/hacking-roblox-stat-games_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/hacks-roblox-descargar_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/give-me-robux-now_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-hack-trick-2021_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/bloxburg-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/roblox-free-play-no-download-online_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/roblox-noclip-and-fly-hacks_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-hack-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/free-money-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-gifts-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/roblox-prison-life-hack_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_002_off00002eda.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2EDA 22336 bytes
SHA-256: de20acb9bb1e28c1283558a5267d026e9c276a615e3a5670af7862be0065ad7b
font_01_sfnt_off00005f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F90 18976 bytes
SHA-256: 2be0fca1477d06bba603c393dad1761654b53599fc718925d7eece702ba6c269

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