Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b828fda441b3b3…

MALICIOUS

PDF

34.2 KB Created: 2021-07-07 07:00:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 374f18b7e358fa92fd2f15d2cfe1a66d SHA-1: ba80e3044ea0072b853e735ffb9e1b03d8db8a50 SHA-256: 92b828fda441b3b337ba4e4c389f00da4d022dd022ff7fa44aa8d16f0568ff5e
220 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are identified as malicious redirectors or part of a link farm. The document body and extracted links suggest a lure related to game hacks and virtual currency, aiming to trick users into visiting potentially harmful sites. The presence of multiple PDF links and a critical heuristic for malicious redirectors indicates a high likelihood of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/how-do-you-get-robux-on-roblox-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-roblox-studio-ship-script_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/download-roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/como-hackear-roblox-para-tener-robux-en-telefono_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-tiktok-likes-2021_GM835599320.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/hack-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/games-like-minecraft-but-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/cheat-seconds-thill-death-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/life-in-paradise-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-100-spin-hack_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/pokemon-go-free-candy-cheat_GM1094591345.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
font_00_sfnt_off00002ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EA3 22124 bytes
SHA-256: 4e5b98eb6c0b5d483f0f007621f7ea7779254663b69b8722c09ea2144d05ef2c
font_01_sfnt_off00005fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC5 19224 bytes
SHA-256: 95775dbe9d5c5d02c2087d1f26a1dbf84b585577f9403205c74baa1bbd57bf4f

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