Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a170d1fe62c87b…

MALICIOUS

PDF

33.5 KB Created: 2021-07-05 18:56:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5cca5e671456ac8f74ef7e09a1e3e940 SHA-1: 1851ea2ac7b67d4d3679d87966618ee559e9079a SHA-256: 33a170d1fe62c87b4c9d0e59a99f472e4be7402b10bb9833cbea0ddb4e389923
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically advertising 'game hacks' and 'free generators' for popular games. The primary redirector URL is http://netcdn.tw/app/479516143/minecraft-kill-aura-game-hack, which is associated with malicious activity. The document body and heuristics indicate a lure to download potentially unwanted or malicious content.

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/479516143/minecraft-kill-aura-game-hack In PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-robux-no-hack-no-scam_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/roblox-gift-card-redeem-free_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-game-codes-roblox_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-spins-generated-from-coin-master_GM406889139.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-robux-site_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/hacks-de-roblox-para-conseguir-robux_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/hacker-names-on-roblox_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/coin-master-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/mcpe-download_GM479516143.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/roblox-my-boyfriend-cheated-on-me_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/roblox-hack-tool-download_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-robux-hacks-no-verification_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_off0000301c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x301C 22224 bytes
SHA-256: 58045105868f01d026600211b7e09f91db5c8b8b5183955d22848915fe85ab7d
font_01_sfnt_off00006128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6128 18072 bytes
SHA-256: 4103c7d9fc11388aca665cdc644ef37cc482c880eab919eb5102c840a242c823

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