Malicious PDF — malware analysis report

Static analysis result for SHA-256 651cd273f1b3f75c…

MALICIOUS

PDF

33.8 KB Created: 2021-07-06 08:16:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: ea2a5d7fb8568ea011c5ffd287aacef1 SHA-1: 7bafb2b3cdbf0548378089e586bbd22bcf4328a4 SHA-256: 651cd273f1b3f75ca2d1fc8e926ae6e6b228cbf720f886d1223c7d7bfd6978bc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirector infrastructure, specifically advertising 'free generators' and 'hacks' for popular games. The primary malicious URL identified is http://netcdn.tw/app/431946152/websites-for-robux-game-hack. The document body and heuristics indicate a lure for game-related cheats, aiming to redirect users to potentially harmful sites. No scripts were extracted, but the embedded URLs and redirector findings strongly suggest a phishing or scam attempt.

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/431946152/websites-for-robux-game-hack In PDF document text
    • https://www.sd-olimp.hr/files/coin-master-latest-version-hack_GM406889139.pdfIn PDF document text
    • http://sd-olimp.hr/files/policesim-hack-roblox_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/roblox-free-clothes-codes_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/card-hack-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/coin-master-link-app_GM406889139.pdfIn PDF document text
    • http://sd-olimp.hr/files/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/mcpe-optifine_GM479516143.pdfIn PDF document text
    • http://sd-olimp.hr/files/free-robux-link_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/how-to-get-a-refund-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/free-spins-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://sd-olimp.hr/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/how-to-cheat-roblox-jailbreak-glitches_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/android-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://sd-olimp.hr/files/como-tener-dinero-infinito-en-jailbreak-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/dragon-ball-x-in-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/mod-hackeadas-para-roblox_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/free-robux-no_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/coinmaster-fan-page_GM406889139.pdfIn PDF document text
    • http://sd-olimp.hr/files/roblox-1billion-robux-hack_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_off00002f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F04 21628 bytes
SHA-256: 28f33bb6ac8584a2fe09d73f9182bc302769831c1c32e90a74279a91ff697122
font_01_sfnt_off00005e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E74 19136 bytes
SHA-256: 0efb9ad38cdb6f9f681febee216806226f9714dffb94f25e4a6b4ea55d3eee9d

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