Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f9e7c297d3a840…

MALICIOUS

PDF

34.8 KB Created: 2021-07-09 20:12:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 62401a51f5aed2295eaaf10b08db3e1f SHA-1: 4636b30c70aa9b4f3330241009bae12d0330977c SHA-256: d4f9e7c297d3a84024e27a695a95efccbedc407fcccdba18435198b583fba64f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirector lure, pointing to a known malicious URL. The document body also contains this URL, reinforcing the lure. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

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/blogspot-coin-master-free-spins-game-hack In PDF document text
    • https://www.tena-g.hr/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/free-robux-please_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/fly-hack-for-roblox-booga-booga_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-robux-android_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/roblox-com-free-clothes_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/how-to-make-a-server-in-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • https://www.tena-g.hr/files/roblox-hack-cheat-engine-jailbreak_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • https://www.tena-g.hr/files/how-to-get-free-robux-on-ipad-mini_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/new-account-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/how-to-get-free-robux-without-human-verification-and-survey_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/games-in-roblox-with-free-radio_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/working-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-free-coins-and-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/studio-free-10-000-robux-lim_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-free-spins-1701-20_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/how-to-get-free-robux-hack-2021_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_off0000312c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x312C 22972 bytes
SHA-256: 6a9ed213ac492d8881dbc6fa96aff97f1c1370539ea827a1b5c84e0a60cd8d8c
font_01_sfnt_off000064dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64DC 18464 bytes
SHA-256: d4f4a4328566268ab963e7ab93eb9b97adb01760eea7805a91b582d18af7b90a

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