Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f6d59abbba549f…

MALICIOUS

PDF

45.2 KB Created: 2021-06-11 03:47:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 56a18e7cd2caf73aca0e4a057e145796 SHA-1: e22b7d47c3a7d4a733558ab2fd9c9806c55838b9 SHA-256: f1f6d59abbba549f7cb29bd674c0fb0c6c8bf9d1455d4cebe7b1d29b4169a1f3
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to free game currency and hacks, directing users to a malicious redirector at 'https://netcdn.tw/app/431946152/roblox-2021-robux-free-game-hack'. It also contains a large number of links to PDF files hosted on 'elsenorcafe.com.co', suggesting a link farm designed to distribute further malicious content or engage in SEO manipulation. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/roblox-2021-robux-free-game-hack In PDF document text
    • http://elsenorcafe.com.co/images/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/earn-robux-com_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/minecraft-free-app_GM479516143.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/como-hackear-dragon-ball-fury-roblox_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/free-coin-app_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/free-robux-limited-time-only_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/coin-master-spin-link_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/free-spin-today-coin-master_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/how-to-hack-and-get-free-robux_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_004_off0000522a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x522A 25624 bytes
SHA-256: 5e4efbeb52e67a122cbebec8465c7c5ff4c6c2e196816907adfc4491e8dbfe8f
font_01_sfnt_off00008d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D55 18488 bytes
SHA-256: 6f7cd42b591bc6060c27bd2d2318e95b4fd0646ad7a183694d03d21018915573

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