Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8179e406e3f1f2…

MALICIOUS

PDF

34.0 KB Created: 2021-07-04 20:35:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a1b967e6107d84284b1f59c063a98324 SHA-1: 5ce69adbbb33f3ee552785dc77d1de4957346d57 SHA-256: ec8179e406e3f1f2dc355224a1a720006e72fc36383974c4c6f6b2ea403bfd59
180 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 document contains multiple embedded URLs, including one pointing to a known malicious redirector infrastructure at http://netcdn.tw/app/406889139/how-to-get-free-spins-and-coins-in-coin-master-game-hack. Additionally, several links point to raw IP addresses hosting further PDF files, suggesting a chain of malicious documents designed to exploit users. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/how-to-get-free-spins-and-coins-in-coin-master-game-hack In PDF document text
    • http://103.40.122.33/akasia/repository/roblox-fly-hack-dll_GM431946152.pdfPDF link annotation
    • http://103.40.122.33/akasia/repository/free-white-hair-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/proxy-roblox-hack_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-avatar-free-superhero-body_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/ultimate-trolling-gui-roblox-hack-script_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-hack-roblox-without-a-app_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/can-pokemon-go-free-incense_GM1094591345.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/hack-para-jailbreak-roblox-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/military-simulator-roblox-hack_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-free-executor-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-code-for-huge-cat-pet-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/minecraft-font-free_GM479516143.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-have-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-guaranteed_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-free-roblox-no-survey_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_off00003060.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3060 22180 bytes
SHA-256: ad2c9a97089c1425b0c4c1af51c0c2979a14a47122e50e6cf4da7dc7ff4a4862
font_01_sfnt_off00006176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6176 18512 bytes
SHA-256: 54df8a09cf421af6cac57c3a8dff085e717b90c55c616740be0d1644a88c75b3

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