Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1fad3c35f0e3b5…

MALICIOUS

PDF

42.3 KB Created: 2021-05-19 19:22:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 44c0b53bf1c7e39b7a0be192ac310178 SHA-1: 4a44c20a7470ed9ba5e911c4274a96c684d35444 SHA-256: db1fad3c35f0e3b50b5098acdc73e7563ff26ce0c3874228880ad1bfc17aec6e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as download buttons for game hacks and free items. The primary malicious URL identified is https://netcdn.xyz/app/431946152/withdraw-robux-game-hack, which is likely used to deliver a secondary payload or redirect to a phishing site. No scripts were extracted, but the embedded links and heuristic firings strongly indicate a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/withdraw-robux-game-hack In PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/coin-master-hack-pc-2021_GM406889139.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/free-minecraft-addons_GM479516143.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/daily-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/minecraft-education-free_GM479516143.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/coin-master-hack-root_GM406889139.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/getrobux-come_GM431946152.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/how-to-get-free-cards-sets-for-coin-master_GM406889139.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/win-free-robux_GM431946152.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/roblox-free-play_GM431946152.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/pokemon-go-free-coins_GM1094591345.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/coin-master-hack-club_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
font_00_sfnt_off000049cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49CC 24052 bytes
SHA-256: fcfdd3a289d77e78434a989d2c8f4f98f112305e8f6f3a17c905d055ebaf5fd4
font_01_sfnt_off000080cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80CB 19004 bytes
SHA-256: 1af1b50e13b79861841ce88764da910b9f7fb16252a783c49889fdff3a55bba6

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