Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fff2912f248484b…

MALICIOUS

PDF

34.3 KB Created: 2021-07-09 03:33:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1fcb4751231d97530377b6c6e0b300e3 SHA-1: 4e86d44956419f5e501b3c1ee2674329d72949b4 SHA-256: 1fff2912f248484b05db1715466bfaf5cd2ef39d01069b9992832c9ab89b07ab
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.tw/app/406889139/coin-master-free-codes-game-hack. The document body and heuristics indicate a lure for game hacks, likely intended to trick users into downloading further malware or visiting malicious sites. The ML classifier strongly flagged this PDF as malicious.

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/coin-master-free-codes-game-hack In PDF document text
    • https://maximabm.com/uploaded_files/userfiles/files/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://maximabm.com/uploaded_files/userfiles/files/hacks-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • https://maximabm.com/uploaded_files/userfiles/files/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • https://www.maximabm.com/uploaded_files/userfiles/files/coin-master-mod_GM406889139.pdfIn PDF document text
    • https://www.maximabm.com/uploaded_files/userfiles/files/roblox-g_GM431946152.pdfIn PDF document text
    • https://www.maximabm.com/uploaded_files/userfiles/files/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • https://maximabm.com/uploaded_files/userfiles/files/roblox-free-skin_GM431946152.pdfIn PDF document text
    • https://maximabm.com/uploaded_files/userfiles/files/best-free-items-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.maximabm.com/uploaded_files/userfiles/files/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://maximabm.com/uploaded_files/userfiles/files/roblox-script-hack-list_GM431946152.pdfIn PDF document text
    • https://maximabm.com/uploaded_files/userfiles/files/coin-master-free-in-app-purchases-jailbreak_GM406889139.pdfIn PDF document text
    • https://www.maximabm.com/uploaded_files/userfiles/files/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.maximabm.com/uploaded_files/userfiles/files/microsoft-bing-robux_GM431946152.pdfIn PDF document text
    • https://maximabm.com/uploaded_files/userfiles/files/how-to-get-robux-without-hacking_GM431946152.pdfIn PDF document text
    • https://www.maximabm.com/uploaded_files/userfiles/files/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • https://maximabm.com/uploaded_files/userfiles/files/best-level-7-free-script-injectors-roblox_GM431946152.pdfIn PDF document text
    • https://www.maximabm.com/uploaded_files/userfiles/files/coin-master-spin-hack-no-verification_GM406889139.pdfIn PDF document text
    • https://maximabm.com/uploaded_files/userfiles/files/how-to-get-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://www.maximabm.com/uploaded_files/userfiles/files/super-jump-cheat-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://www.maximabm.com/uploaded_files/userfiles/files/roblox-credit-card-free_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
stream_002_off00003149.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3149 22616 bytes
SHA-256: 034c5451282979513e1fc8a1fc1847a498ad2e4e926fe275aa040f294f2352f3
font_01_sfnt_off000063e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E3 18172 bytes
SHA-256: da47515c3b4c9ce74a6a7925be58a2cec6625ddcee19f7c3d533689243930cbf

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