Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b5628707cac751…

MALICIOUS

PDF

37.0 KB Created: 2021-07-06 03:38:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9343621367c708f7e9e5cd8fb2a79d1c SHA-1: 9104e959865fcaf7544b6811754c271761f1a3a0 SHA-256: d8b5628707cac751859711a6019beee87228872acf6c0b45db4c131e41b7eeaa
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs, with one identified as a malicious redirector. The document body and heuristics indicate a lure for game-related cheats, aiming to direct users to potentially harmful content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure suggest an attempt to lead the user to a malicious site, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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/free-rare-cards-for-coin-master-christmas-game-hack In PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/john-doe-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/comandos-de-cosas-hacker-de-roblox-locos_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/master-coin-hack_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-tips_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-cheat-in-weight-lifting-in-roblox_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/500-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-chest-coin-master_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-go-300-free-diamonds-on-roblox-royale-high_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-hack-salto-otros-jugadores_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-hack-no-survey-or-verification_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-mod-hack-apk-download_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FBC 22768 bytes
SHA-256: a080eaa18caffca4abe6569f8a3dd73db89ce78509ff27bb273dfff36122f89f
font_01_sfnt_off000062e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62E7 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00006ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CCC 18600 bytes
SHA-256: 784c5c43db1f59aa9405f56eca204774df99ad96af592b59070832778e8bce4d

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