Malicious PDF — malware analysis report

Static analysis result for SHA-256 51313d66ff861ca5…

MALICIOUS

PDF

35.1 KB Created: 2021-07-04 07:26:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b34e78da53ad9de6101f0e2f8a2ef2ae SHA-1: 05824a950b5fa9f108f50c91c5c7f536279ca79e SHA-256: 51313d66ff861ca52df0f4e72a5c88a5a37213ac4f1371d54db3155410672ac3
160 Risk Score

Malware Insights

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

This PDF document employs a lure of free game currency and hacks to trick users into clicking malicious links. The primary link directs to a known malicious redirector infrastructure, which likely serves as a gateway to further malicious content or exploits. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to exploit vulnerabilities or deliver a payload, aligning with common phishing and exploit delivery techniques.

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.co/app/406889139/master-free-spins-and-coins-game-hack In PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/free-t-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/mcpe-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/are-roblox-hack-clients-real_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/roblox-hack-scripts-exploit_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/how-to-hack-any-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/hack-the-game-coin-master_GM406889139.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/hack-account-roblox_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/free-roblox-hair-girl_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/com-free-robux_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/cheating-roblox-girlfriend_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/free-robux-instantly-2021_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/coin-drop-master-free_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
stream_002_off0000314f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x314F 23420 bytes
SHA-256: 9fbd1bff027c3b23111972df4ec3825c385d43d9f8b23f8f9e8649bb073b5a27
font_01_sfnt_off00006670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6670 18348 bytes
SHA-256: 5321b7127370ebf6f6dfbf643ed4bfa6daf0fc81f1b3cb36fd08dfd1331f5ac7

Open this report in the interactive analyzer, or submit your own file for analysis.