Malicious PDF — malware analysis report

Static analysis result for SHA-256 c975037dd954250e…

MALICIOUS

PDF

44.9 KB Created: 2021-05-13 05:35:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: bd73412fff028e6432af68aa5d64cae1 SHA-1: 56b492bbb228d8db689a1a55635104081ddd7f23 SHA-256: c975037dd954250ecdb8b1f8eb6949ccad3c524f2d287fa5986315a88bbb8bb9
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector and also links to an IP address hosting further PDF files. The document body, though heavily obfuscated, contains references to 'free spins' and 'game hack', suggesting a lure for potentially unwanted content or malware. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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 https://netcdn.xyz/app/406889139/coin-master-real-free-spins-game-hack In PDF document text
    • http://110.232.83.89/slimsppks/repository/free-robux-codes-2021-not-used_GM431946152.pdfPDF link annotation
    • http://110.232.83.89/slimsppks/repository/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/free-robux-wheel_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/microsoft-roblox-rewards_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/daily-coin-master-link_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/free-custom-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/how-to-get-100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/best-way-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/roblox-sexually_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/coin-master-game-for-pc-free-download_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/coin-master-free-spins-and-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/levvvel-coin-master_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/roblox-got-talent-piano-hack_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/online-hacking-tricks-coin-master_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/free-coin-master-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004bf1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BF1 24456 bytes
SHA-256: 6da2eafed2e34bbe63f75c145d1ef5824ef289f5f23cfd03d7edb646fabe1909
font_01_sfnt_off000083d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83D3 2928 bytes
SHA-256: 0bb26577d52c8d51e00ad4edc5eaecc41f30204c62dca387b29f5eedfceecc2d
font_02_sfnt_off00008df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF0 17960 bytes
SHA-256: 614295126cde334420460b671e97520ef00bc17125d6db356981682f81072261

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