Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87dc77324e71684…

MALICIOUS

PDF

45.3 KB Created: 2021-06-08 14:09:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a8700ecbf849f935b8555ed81b480d22 SHA-1: f9c9cb44238665e3b2f03e1d38466945ea1475ae SHA-256: f87dc77324e716849682e51aae9527a4811f01a07534d68a2bd18ff009815faa
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to free game currency, directing users to a known malicious redirector. The embedded URL, https://netcdn.tw/app/431946152/how-to-get-500-robux-for-free-2021-game-hack, is flagged as malicious and part of a redirector infrastructure. This suggests the document is designed to trick users into visiting a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/how-to-get-500-robux-for-free-2021-game-hack In PDF document text
    • https://elearning.man2kotatangerang.sch.id/__statics/gudangsoal/files/roblox-account-has-been-hacked-and-password-has-been-changed_GM431946152.pdfIn PDF document text
    • https://elearning.man2kotatangerang.sch.id/__statics/gudangsoal/files/top-ten-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.man2kotatangerang.sch.id/__statics/gudangsoal/files/roblox-free-items-website_GM431946152.pdfIn PDF document text
    • https://elearning.man2kotatangerang.sch.id/__statics/gudangsoal/files/hack-roblox-mobile_GM431946152.pdfIn PDF document text
    • https://elearning.man2kotatangerang.sch.id/__statics/gudangsoal/files/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • https://elearning.man2kotatangerang.sch.id/__statics/gudangsoal/files/roblox-hacks-phantom-forces-2021-regedit_GM431946152.pdfIn PDF document text
    • https://elearning.man2kotatangerang.sch.id/__statics/gudangsoal/files/how-to-get-free-coins-in-roblox-bandit-siimuator_GM431946152.pdfIn PDF document text
    • https://elearning.man2kotatangerang.sch.id/__statics/gudangsoal/files/hackeando-mi-saldo-de-roblox-sin-pagar_GM431946152.pdfIn PDF document text
    • https://elearning.man2kotatangerang.sch.id/__statics/gudangsoal/files/free-robux-from-surveys_GM431946152.pdfIn PDF document text
    • https://elearning.man2kotatangerang.sch.id/__statics/gudangsoal/files/how-to-say-the-f-word-in-roblox-without-hacks_GM431946152.pdfIn PDF document text
    • https://elearning.man2kotatangerang.sch.id/__statics/gudangsoal/files/how-to-get-robux-hack-without-human-verification_GM431946152.pdfIn PDF document text
    • https://elearning.man2kotatangerang.sch.id/__statics/gudangsoal/files/https-free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://elearning.man2kotatangerang.sch.id/__statics/gudangsoal/files/how-to-speed-hack-on-roblox-kick-off_GM431946152.pdfIn PDF document text
    • https://elearning.man2kotatangerang.sch.id/__statics/gudangsoal/files/free-roblox-game-publicity_GM431946152.pdfIn PDF document text
    • https://elearning.man2kotatangerang.sch.id/__statics/gudangsoal/files/ccv3-cheat-engine-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.man2kotatangerang.sch.id/__statics/gudangsoal/files/how-to-look-cool-for-free-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.man2kotatangerang.sch.id/__statics/gudangsoal/files/how-to-use-script-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.man2kotatangerang.sch.id/__statics/gudangsoal/files/blood-t-shirt-roblox-free_GM431946152.pdfIn PDF document text
    • https://elearning.man2kotatangerang.sch.id/__statics/gudangsoal/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://elearning.man2kotatangerang.sch.id/__statics/gudangsoal/files/how-to-get-2021-robux-on-roblox-free_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_off000054d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54D0 24392 bytes
SHA-256: cf38b79ff0b44ea4e93e132e2b07cf198967de2f1270cf6ef72ebd16ff2b1f7a
font_01_sfnt_off00008c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C80 18816 bytes
SHA-256: 6e2a830f879ff4350f1969766f0ad1e6b15bb2ddd4bacb0efd90b05255d41c3c

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