Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fb8c461625124a…

MALICIOUS

PDF

36.0 KB Created: 2021-07-08 11:10:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: db3fe775bbb3eaeecf7360df205f2e68 SHA-1: 4ee9c591e0307d68b5af3cc578ace3be616400ad SHA-256: 91fb8c461625124a1cb84d988e524e9317e2bdb2e24639743573d7217b84f3ba
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites offering game hacks and free in-game currency, such as Coin Master spins and Roblox Robux. One of the primary links directs to a known malicious redirector infrastructure, indicating a high likelihood of leading users to malicious content or malware. The document's structure and content strongly suggest a phishing or scam attempt designed to exploit user interest in free game items.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://netcdn.tw/app/406889139/coin-master-free-spins-today-daily-links-game-hack In PDF document text
    • http://118.98.227.172/opac/repository/coin-master-free-spin-and-coins-links_GM406889139.pdfPDF link annotation
    • http://118.98.227.172/opac/repository/cant-make-my-items-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/coin-master-70-spin-link_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/robloxfun-com-robux_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-get-robux-on-roblox-for-free-easy_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/banned-from-free-draw-2-on-roblox-for-no-reason_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-robux-and-tix-generator-2021_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/roblox-mad-city-cheat-codes_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/generator-robux-sans-hack_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/coin-master-daily-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/200-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-wings-roblox-accessories_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/coin-master-free-spin-link-list_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-do-speed-hack-in-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-get-free-clothes-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-robux-pins-2021_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-get-free-spins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/redeem-free-robux-code_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_002_off0000351e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x351E 22908 bytes
SHA-256: 5b4914ce45e2b6939407b69d65e24497793f3635a5bb12ffca08d8de476ecc9a
font_01_sfnt_off00006851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6851 18940 bytes
SHA-256: 74e1d82992a432109423c701e24adf08bd24e863db22c1b49c4282e3a69c5270

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