Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ffe67c0a79cbcc…

MALICIOUS

PDF

42.3 KB Created: 2021-06-13 21:47:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6933108d4404b0b90efb0dc13a5c37a2 SHA-1: ce73f1786e47c7400e1120d2ec8ca800a8e7a5a5 SHA-256: b8ffe67c0a79cbcc3e135e090625feb498d496c06e15d90a7e72c602c25372c7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to what appears to be a game hack or free currency lure, specifically targeting 'Robux' and 'Coin Master'. One of the primary links, http://netcdn.co/app/431946152/how-to-get-free-robux-instantly-without-human-verification-game-hack, is flagged as malicious and part of a redirector infrastructure. The document body, though partially corrupted, contains similar lure text and URLs. No scripts were extracted, but the presence of malicious redirector links and the lure content strongly suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.co/app/431946152/how-to-get-free-robux-instantly-without-human-verification-game-hack In PDF document text
    • http://apartmani-mestrovic-krk.hr/files/coinmasterfree_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/coin-master-mod-version-free-download-v344_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/roblox-gun-game-hacks_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/earn-robux-today-for-free_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/minecraft-114-4-download_GM479516143.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/free-tiktok-likes-app_GM835599320.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/coin-master-hack-blog_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/coin-master-hack-ios-cydia_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/totally-free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/roblox-royale-high-how-to-get-free-diamonds_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-robux-now_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/pokemon-go-free-leafeon_GM1094591345.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_off000046ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46CE 24748 bytes
SHA-256: 826425831dd6dc7fa3d30d4398f23a96520f525168f211ab17b492773f425769
font_01_sfnt_off00007eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EEF 19640 bytes
SHA-256: ffbcb0877a539e6a44d446971455a83382f0765e744616ed226e338918ba85a8

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