Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba4aafeb223cdda…

MALICIOUS

PDF

41.8 KB Created: 2021-05-13 07:01:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 43d01ff1bbf2b0b9bf05bbd9b1811699 SHA-1: aa821e90d6b5890da6242ff2a6dff5bb23289e88 SHA-256: 7ba4aafeb223cdda7193a6f27cc4766404a8442c1bc437e14d2c498bf973ae00
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links designed to lure users into clicking on them, promising free game-related items. The primary URL, https://netcdn.xyz/app/431946152/roblox-games-com-free-game-hack, is identified as a malicious redirector. The document body and heuristics indicate a mass link farm strategy, directing users to other PDFs hosted on gigbagwinkel.nl, likely as part of a phishing or scam campaign. No scripts were extracted, but the overall structure and URL analysis strongly suggest a malicious intent to redirect users to potentially harmful content.

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/431946152/roblox-games-com-free-game-hack In PDF document text
    • https://gigbagwinkel.nl/images/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/gamehunters-coin-master_GM406889139.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/minecraft-mojang-free_GM479516143.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/free-roblox-generator-for-roblox_GM431946152.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/coin-master-free-link-blogspot_GM406889139.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/free-accessories-roblox_GM431946152.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/play-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/minecraft-mod-menu_GM479516143.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_off000046ae.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46AE 25916 bytes
SHA-256: 11c53e3a9f89a6203fa6a37520ed14ce2c6e199360d491df6d2a1dee9dc7f66b
font_01_sfnt_off0000805a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x805A 18436 bytes
SHA-256: 12a1ebdc23dbe72020258fb4b08eb8446381ab7182b16aac5facd4bdcef33cb0

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