Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed77073b9438aa95…

MALICIOUS

PDF

35.6 KB Created: 2021-07-06 11:55:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 23626e81667fbc14bff598a258569406 SHA-1: d9df4a7725c4c432651d4789b2912de0cca69be1 SHA-256: ed77073b9438aa95a18d1d8d63f3b9cc540e6f403e96d872a30abc8efee4af94
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to malicious infrastructure, specifically targeting users with lures for free game items and hacks. The primary redirector URL is http://netcdn.tw/app/431946152/free-robux-no-survey-or-human-verification-game-hack, which then leads to other malicious PDFs hosted on samavetpharm.com. This indicates a phishing or scam campaign designed to trick users into visiting malicious sites, likely for credential harvesting or further malware delivery.

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/free-robux-no-survey-or-human-verification-game-hack In PDF document text
    • http://samavetpharm.com/userfiles/files/hack-coin-master-apk-32-download_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-free-spins-without-verification_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/ccv3-roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/minecraft-xbox-one-free_GM479516143.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-make-a-roblox-group-for-free_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/legit-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/roblox-knife-hack_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/roblox-promo-codes-free-items_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/cool-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/roblox-stylish-animation-free_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/pubg-uc-earn_GM1330123889.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-online-free-spin_GM406889139.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_off00003260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3260 22452 bytes
SHA-256: e0af3a7a624fe9f816138f3f1b580b534a33f049816cd7c5178901b1ffc09f20
font_01_sfnt_off00006462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6462 19628 bytes
SHA-256: cdea958d27f31e1bb93a151c26d135a3dbedf9ed5520af1903eb9fa34a77bfdd

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