Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5d70d342946448…

MALICIOUS

PDF

50.3 KB Created: 2021-06-08 12:41:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6af2f278ea8b3286848158a7d78e3566 SHA-1: 35a29ce34e4a76a86dcd01c88e9830b21bae1cc3 SHA-256: fa5d70d342946448cd2d66c999b38bfab7c4ef32e7ff87614afd363d80b14a61
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically advertising 'free generator / game hack' lures for popular games like Roblox. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs and a visual download button further supports a malicious intent. The primary link, 'https://netcdn.tw/app/431946152/how-to-get-free-robux-no-downloading-games-game-hack', is identified as a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/how-to-get-free-robux-no-downloading-games-game-hack In PDF document text
    • https://htdvn.com/public/upload/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-links-coin-master_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-free-coins-hack_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/minecraft-mobile-free_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-fan_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-free-spins-link-no-verification-code_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/robux-fun-hack_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/minecraft-xbox-one-edition-digital-code-free_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-vip-server-roblox_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/minecraft-font-free_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-hackcom-xyz_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-hackhub-coin-master_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-minecraft-hosting-24-7_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/mcpe-116_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-executor-free-download_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/appsmob-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FCC 26548 bytes
SHA-256: dea86a541645a7dc67a8237b04d85d9dcd5f56598c750b77220858ea9d90a377
font_01_sfnt_off00008c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C4D 7448 bytes
SHA-256: a76ff9b4805dcff342f7268a16e2e3c2ff2b31b96c381fe4deb6ceea777bce90
font_02_sfnt_off00009e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E30 19596 bytes
SHA-256: a4000f81350e38ec83a4d1f79eab6adffd1ab47c2bc87849e87d5f132f749fbf

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