Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3dcdb27acb1c42…

MALICIOUS

PDF

35.3 KB Created: 2021-07-04 09:03:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2f5e0c425a07a20ac78e04e1bce0913d SHA-1: 6a47be6090b7d5149ffe0bf4f35518b8736b2280 SHA-256: 9d3dcdb27acb1c42de38effb2532ab4cadb20f027f48f6191cbc08f96abb1173
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' content for games like Roblox. The primary malicious URL identified is http://netcdn.tw/app/431946152/roblox-game-free-download-game-hack. This pattern suggests a lure to trick users into visiting potentially malicious sites, likely for credential harvesting or further malware delivery. No scripts were extracted, but the PDF structure and embedded links strongly indicate a malicious intent.

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/roblox-game-free-download-game-hack In PDF document text
    • https://tena-g.hr/files/how-to-get-free-robux-2021-unpatched_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/i-want-free-robux-visit-this-site-www-roblox-us_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/code-free-robux_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/robux-gratuit-2021-sur-pc-facilement-free-no-aplicasion_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/how-to-hack-yourself-robux_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/how-to-take-free-robux_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/coin-master-on-facebook_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/hack-coin-master-dzooka_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/cm-spin-link_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/roblox-phantom-forces-free-money_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/how-can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://tena-g.hr/files/lifting-simulator-roblox-cheat_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/hack-coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/free-robux-com-real_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-robux-download_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/robux-free-ultimategamer365_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-robux-no-email_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
font_00_sfnt_off00003064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3064 22916 bytes
SHA-256: ba4edff503f9a86cccdad23488b8dcb06f6aacf9f0783bd80cb050abdd35bd89
font_01_sfnt_off000063d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63D2 19416 bytes
SHA-256: a2f27b52acabb0167f9a542fed976ebd18b11ecd499185880ec5860d5673245b