Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd00e8e30deb655…

MALICIOUS

PDF

34.3 KB Created: 2021-07-06 15:10:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d089f14df1885b2dd4c1547f7d5cbda7 SHA-1: 7ba3cf5a04b588324ab1b8c1266c16db17c06086 SHA-256: ebd00e8e30deb655534aaca2804e8dd82ec3ae58597570df9cb6ab195385e99d
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links that redirect to malicious infrastructure, impersonating brands like Amazon to lure users. The primary malicious URL identified is http://netcdn.tw/app/835599320/tiktok-freepik-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to exploit vulnerabilities or trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.tw/app/835599320/tiktok-freepik-game-hack.
  • 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/835599320/tiktok-freepik-game-hack In PDF document text
    • http://www.elibrary.perludem.org/repository/hack-to-bypass-roblox-human-verification_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-donation_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-gold-cards-free-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-get-free-roblox-tickets_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-june_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-quick-generator_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-gift-card-free-codes_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/admin-command-cheat-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/hack-programm-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-many-levels-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-jailbreak-money-cheat_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/new-free-robux-hack-pastebin_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-free-trial_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-hack-1021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-roblox-accounts-generator_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-hack-unlimited-spins-and-coins-cheats_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/good-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-spins-on-coin-master-link_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
stream_002_off000030d0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30D0 22596 bytes
SHA-256: 9272fd185a44d910fcb0c38cd6103b4a0cedbf60303b11461096325c77218f4a
font_01_sfnt_off0000639f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x639F 18148 bytes
SHA-256: ac5e8d54ebbf1f3e506eb9b0a7d3879884bc7125fcac0054882feed940e8bb68

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