Malicious PDF — malware analysis report

Static analysis result for SHA-256 97cab066b1f17b41…

MALICIOUS

PDF

35.0 KB Created: 2021-07-04 06:08:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ec047c93bdf61d3a85daafbc4336ba61 SHA-1: 4f3de94651d3bb096f3985ce72ba103f89b1d672 SHA-256: 97cab066b1f17b41a4752042ebe48aa3b2f4e22df40c6359ac2cfa2249ec7c16
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including one to a known malicious redirector, designed to lure users into clicking on promises of free game currency and hacks. The document body and heuristics indicate a scam or phishing attempt, likely leading to further malware download or credential harvesting. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/how-to-get-free-robux-promo-codes-game-hack In PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-get-real-robux_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-get-any-gamepass-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/roblox-piano-songs-to-play-delay-hack_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/coin-master-hack-injection_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/a-hack-to-steal-robux_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/como-hackear-cuentas-en-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/roblox-free-exploit-no-virus_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/free-college-textbooks-tiktok_GM835599320.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/free-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-get-free-mods-in-minecraft_GM479516143.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/free-minecraft-maps_GM479516143.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_off00003193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3193 22072 bytes
SHA-256: 7b02ee9564acdb842fac3ff70ca96e88037529f95fa240af4365fc1f7fdf0051
font_01_sfnt_off0000624b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x624B 19572 bytes
SHA-256: 0dadee5e3cc3b2abbaca990777016bf93155e721bdd32ff7d925edbe6cadea8f

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