Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb8abb66c015381…

MALICIOUS

PDF

46.4 KB Created: 2021-06-09 11:30:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2d36931931b5c22faf09f619940e3475 SHA-1: 50974df8235b54e78dce1bf7fcbdcb085324380d SHA-256: afb8abb66c015381118a26ffa757277da64569dcbca6325d07b0e8f329c6e793
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'free generator' or 'game hack' lures. The primary URL, https://netcdn.tw/app/431946152/hack-robux-gratis-2021-game-hack, is associated with a game hack lure. The document body, though heavily obfuscated, contains references to similar lures and embedded URLs, suggesting a phishing or scamming attempt designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

Heuristics 4

  • 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.
  • 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/hack-robux-gratis-2021-game-hack In PDF document text
    • http://dana1157.com/images/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://dana1157.com/images/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://dana1157.com/images/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://dana1157.com/images/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://dana1157.com/images/free-robux-site_GM431946152.pdfIn PDF document text
    • http://dana1157.com/images/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://dana1157.com/images/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • http://dana1157.com/images/hacking-a-roblox-game_GM431946152.pdfIn PDF document text
    • http://dana1157.com/images/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://dana1157.com/images/free-robux-script_GM431946152.pdfIn PDF document text
    • http://dana1157.com/images/cool-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://dana1157.com/images/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://dana1157.com/images/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://dana1157.com/images/minecraft-pocket-edition-free-ios_GM479516143.pdfIn PDF document text
    • http://dana1157.com/images/20210-robux_GM431946152.pdfIn PDF document text
    • http://dana1157.com/images/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • http://dana1157.com/images/coin-master-reward-link_GM406889139.pdfIn PDF document text
    • http://dana1157.com/images/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://dana1157.com/images/coin-master-free-bonus_GM406889139.pdfIn PDF document text
    • http://dana1157.com/images/free-spin-coin-master-apk_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_004_off00004e25.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E25 24552 bytes
SHA-256: eb2f951900537f9a56834fc434c5cfad38d8b160d7fbeea1f7deaab8b2191efe
font_01_sfnt_off00008693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8693 2880 bytes
SHA-256: 552e62132cae3603ce0819827e44d96a992bd06014cc5080bf3af4b2ea155b3e
font_02_sfnt_off0000906b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x906B 18872 bytes
SHA-256: a9a5851bd44b2b081ad62234ba3fa556240e722ce2fd8d93defe52a398d112a5