Malicious PDF — malware analysis report

Static analysis result for SHA-256 f49b9e1822e5c7be…

MALICIOUS

PDF

50.0 KB Created: 2021-06-09 14:53:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3d5425347e53f829f2c7fcd34e202aa5 SHA-1: aa0c1e10b99ed6d832ce61af972007b462ffb426 SHA-256: f49b9e1822e5c7be26e87d5c857d6b66879c5b73de4c39cac10e9dfde613f081
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as game hacks and free generators. The primary malicious URL identified is https://netcdn.tw/app/431946152/hack-day-z-2-roblox-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a redirection-based attack, likely intended to lead users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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 https://netcdn.tw/app/431946152/hack-day-z-2-roblox-game-hack In PDF document text
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/ho9w-to-turn-roblox-exploit-lego-hack_GM431946152.pdfIn PDF document text
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/coin-master-pet-food-hack_GM406889139.pdfIn PDF document text
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/how-to-win-robux_GM431946152.pdfIn PDF document text
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/doctor-louie-roblox_GM431946152.pdfIn PDF document text
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/easiest-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/coin-master-free-spins-for-iphone_GM406889139.pdfIn PDF document text
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/roblox-c9m_GM431946152.pdfIn PDF document text
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/free-roblox-outfits-2021_GM431946152.pdfIn PDF document text
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/watch-videos-for-robux_GM431946152.pdfIn PDF document text
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/coin-master-free-chest-link_GM406889139.pdfIn PDF document text
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/free-points-robux_GM431946152.pdfIn PDF document text
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/how-do-i-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/free-robux-group_GM431946152.pdfIn PDF document text
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/free-unused-roblox-cards-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005516.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5516 31724 bytes
SHA-256: 500d7bf3cc234db89d8af14cb05726063e99fe411e63b1ad37c9d93aa46d836e
font_01_sfnt_off00009f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F7E 18748 bytes
SHA-256: eeabe6753d06e2c343277e2ad6759b864559fb4e19ce2b8c38cbcc9313f9af4b

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