Malicious PDF — malware analysis report

Static analysis result for SHA-256 496a95973e7c4152…

MALICIOUS

PDF

33.7 KB Created: 2021-07-04 23:16:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0b0978e4c6cd319b4bdff721d23c8e17 SHA-1: 4faaaa366b27f8368ae3a8fa9c7ae622fea12c07 SHA-256: 496a95973e7c4152bf4d27325620cf20444a9beddf6dd33000dd45fd831118db
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising game hacks and free currency generators. The primary lure URL is http://netcdn.tw/app/431946152/boku-no-roblox-hack-game-hack, which is flagged as a malicious redirector. The document body and embedded URLs reinforce this lure, aiming to trick users into downloading potentially harmful content. No scripts were extracted, but the embedded URLs and redirector behavior are strong indicators of 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/boku-no-roblox-hack-game-hack In PDF document text
    • https://malungtreks.com/userfiles/files/minecraft-115-2-hacks_GM479516143.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/free-robux-codes-download-2021_GM431946152.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/roblox-free-hair-boy_GM431946152.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/get-free-cards-coin-master_GM406889139.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/do-coin-master-hacks-work_GM406889139.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/chicken-farming-simulator-roblox-cheats_GM431946152.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/money-hack-roblox-galaxy_GM431946152.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/free-minecraft-com_GM479516143.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/chat-hack-download-roblox_GM431946152.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/get-free-account-roblox_GM431946152.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/coin-master-sound-daily-free-spins-link-today_GM406889139.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
font_00_sfnt_off00002d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D38 22372 bytes
SHA-256: ebd44424d3d74efe4d5bd0355178e03a410209c4a53135377f319330a53c06cf
font_01_sfnt_off00005f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F21 18796 bytes
SHA-256: 19135353552efac95f1c00fc10c19e7b17473ce31d967bef669c8f4fb6ca84ac

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