Malicious PDF — malware analysis report

Static analysis result for SHA-256 6574077c26f4ae03…

MALICIOUS

PDF

42.9 KB Created: 2021-06-09 10:31:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: f556b1e92cd574a3d7cc72f52c639f6b SHA-1: 39eeaf12f95d6181fdfddd50591eef998d2aff11 SHA-256: 6574077c26f4ae03ff1ecd515c319e362dd064574cd4c83ea3c61653483bde26
220 Risk Score

Malware Insights

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

This PDF document employs a lure related to free game currency and hacks, directing users to a malicious redirector. The redirector, in turn, hosts a link farm of numerous other PDF documents, likely to spread malicious content or engage in SEO manipulation. The primary malicious URL identified is https://netcdn.tw/app/431946152/como-tener-robux-gratis-sin-hacks-game-hack, which is part of a known malicious redirector infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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.tw/app/431946152/como-tener-robux-gratis-sin-hacks-game-hack In PDF document text
    • http://rollipolli.hu/userfiles/files/how-to-change-your-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/google-roblox-games_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/best-free-minecraft-server-hosting-reddit_GM479516143.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/how-to-earn-robux-fast_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/nouveau-hack-robux_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/best-way-to-get-robux_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/minecraft-app-store-free_GM479516143.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/free-mods-for-coin-master_GM406889139.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/master-free-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/coin-master-online-hack_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_004_off00004c03.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C03 24968 bytes
SHA-256: 422bb4fd60217b6e914d652a744d6fd30b1cef68c5323f909112712578278c2a
font_01_sfnt_off000083af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83AF 18732 bytes
SHA-256: 38329a1ad5849f12f67269e0453d381c7c36e1fb12b7306a406de230c208445b

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