Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d0bb20eddf0e657…

MALICIOUS

PDF

41.4 KB Created: 2021-05-11 13:13:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8ac9179aae0bb774ec6a78046cb4ba18 SHA-1: 86ff41d095af9bf35cc8e8d34894a92627aa36e7 SHA-256: 5d0bb20eddf0e65737a2d23558771129c315db57e68d4699b5854c5ad6f3848c
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users into clicking on what appear to be free game item generators or hacks. The primary link directs to a known malicious redirector infrastructure. The document body and embedded links suggest a scam related to popular mobile games like Coin Master and Roblox, aiming to trick users into visiting potentially harmful sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/how-to-get-free-spins-on-coin-master-android-game-hack In PDF document text
    • http://somvisio.es/images/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://somvisio.es/images/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://somvisio.es/images/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://somvisio.es/images/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://somvisio.es/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://somvisio.es/images/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://somvisio.es/images/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://somvisio.es/images/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
    • http://somvisio.es/images/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://somvisio.es/images/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://somvisio.es/images/how-to-get-infinite-robux_GM431946152.pdfIn PDF document text
    • http://somvisio.es/images/roblox-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://somvisio.es/images/free-gold-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://somvisio.es/images/coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://somvisio.es/images/i-cant-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://somvisio.es/images/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://somvisio.es/images/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://somvisio.es/images/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://somvisio.es/images/minecraft-free-school_GM479516143.pdfIn PDF document text
    • http://somvisio.es/images/coin-master-links-for-free-spins_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_003_off00004791.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4791 24436 bytes
SHA-256: 47acf1b358bf27dd8126eb25b444ccc9cf8b0667f07202eb4834cf21b72a9374
font_01_sfnt_off00007f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F79 18224 bytes
SHA-256: e75a85775560c8380404af7b38c0f71a56f3669257afdef98786fb98fd154819

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