Malicious PDF — malware analysis report

Static analysis result for SHA-256 897ce956019c915e…

MALICIOUS

PDF

33.3 KB Created: 2021-07-06 17:06:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 98d2ee56a1574328471eaf6c1437e0b0 SHA-1: 648c90c8b696ef834e19929f1a3a16e2dfdec5b4 SHA-256: 897ce956019c915e3d0c9ebdf9c07462387ec9204b14c91060e6d472c41e0575
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'free generators' and 'game hacks' to lure users. The primary redirector URL identified is http://netcdn.tw/app/479516143/is-java-minecraft-free-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or malware distribution attempt, likely leveraging a social engineering pretext to drive traffic to malicious sites.

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/is-java-minecraft-free-game-hack In PDF document text
    • https://dolphintour.vn/images/uploadsfiles/hack-crack-for-coin-master-currency_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/roblox-booga-booga-hack-script-2021_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/roblox-lion-roleplay-cheats_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/robux-gift-card-codes-free_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-get-free-pokeballs-in-pokemon-go_GM1094591345.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-robux-networks_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/get-real-robux-for-free_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/cm-spin-link_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/roblox-report-hacker_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/robux-fun-hack_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/roblox-old-avatar_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-hack-times-in-roblox-games_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/2021-robux-profe-fro-free_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/minecraft-hacks-list_GM479516143.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/grabpoints-robux_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_off0000305d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x305D 21648 bytes
SHA-256: f380fba6fb642d94cdacec5e7bbcdf7ff05e21405cab4d110b469093b1de4bf5
font_01_sfnt_off00005fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBE 18136 bytes
SHA-256: 2fe6c90bad35e653b7658140d9b8ca9ec084e24d2e8e35657111ab8094fa997a

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