Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f39405c4ad72e75…

MALICIOUS

PDF

35.2 KB Created: 2021-07-04 01:25:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ba09ea0b5d23238a3a76ac58ee302091 SHA-1: 0b19409d0f2da625d290349564046560c59c2674 SHA-256: 1f39405c4ad72e7594a432ce61512cb87126e94fb8cdffa9828d90e87e7a95f3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as lures for game hacks and free spins. The document body and embedded URLs strongly suggest a phishing or scam attempt, likely leading to further malware downloads or credential harvesting. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/406889139/500-free-spins-coin-master-game-hack In PDF document text
    • http://pustaka.bbppketindan.info/repository/com-hackear-cuentas-de-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-support_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/robux-free-youtube-aspire_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/get-roebucks-com_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-minecraft-server-maker_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-apocalypse-rising-hack-codes_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-hack-denis-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/secret-cheats-for-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/delete-anything-roblox-hack-script_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-fun-com-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/2021-robux-proof-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-hack-pc-download_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/robux-hack-2021-ios_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-hack-tool-without-verification_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/inappropriate-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-costumes-in-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-to-get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/get-free-robux-wuthout-any-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-hack-september-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/get-free-gold-cards-in-coin-master_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
stream_002_off00003291.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3291 23016 bytes
SHA-256: 4de00fca093be936666dee265186734abee034b678c6ed1a1ae358071776ee48
font_01_sfnt_off00006635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6635 18480 bytes
SHA-256: f050a5cb8527be99d3c3e84738d571a41e36df8bd1ad63ca537930e630161d23

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