Malicious PDF — malware analysis report

Static analysis result for SHA-256 841c2e2bd260920b…

MALICIOUS

PDF

35.3 KB Created: 2021-07-07 08:45:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f12c3323ba7992c795242bdd4f537ce5 SHA-1: b5eacbe771c93c6e61bbe807705a7b54aaf45f1a SHA-256: 841c2e2bd260920bd6bdd6df921f199cf7bdc270f16886a31caa0465954a123f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to a malicious redirector, specifically http://netcdn.tw/app/406889139/haktuts-coin-master-free-spins-2021-game-hack. This redirector is associated with lures for game hacks and free currency, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious.

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/406889139/haktuts-coin-master-free-spins-2021-game-hack In PDF document text
    • https://tena-g.hr/files/can-you-earn-robux_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/how-to-make-robux_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-roblox-com_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/roblox-svg-free_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/are-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • https://www.tena-g.hr/files/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/get-all-the-tattletails-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-free-link-facebook_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/how-to-get-doge-hat-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/coin-master-ids-for-free-spins_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/free-followers-for-tiktok_GM835599320.pdfIn PDF document text
    • https://www.tena-g.hr/files/roblox-hack-tool-2021_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-builders-club-accounts-on-roblox_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
stream_002_off0000314d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x314D 23304 bytes
SHA-256: 4e122bd12ba6c50d868daf8623f300bd83ee01533c1ca111b5b75571c8632c6b
font_01_sfnt_off000065b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B0 18884 bytes
SHA-256: 419a54345942d61df1c2508925993529a2deda544c7f32f326dbec5b819008ad

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