Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a7808dce70543c…

MALICIOUS

PDF

34.0 KB Created: 2021-07-04 18:17:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1506a5d941d5ff873284aeac0af7843e SHA-1: 90e222b0fd576b71e0848ae9e0fa919be290a61c SHA-256: 44a7808dce70543cb783c9ed91ac0650928fcd2025e15b8e9ce80dfa3c5124c7
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users to external sites, including a known malicious redirector. The document body and heuristics indicate a scam related to game hacks and virtual currency, likely intended to lead users to phishing or malware download pages. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/follower-bot-roblox-free-game-hack In PDF document text
    • http://www.sbairs.com/datas/files/money-cheats-for-rocitizens-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/good-outfit-ideas-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/nbc-roblox-free-accounts_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-tool-hack_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/how-to-get-robux-without-bc-or-hacking_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/break-free-roblox-music-video_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-robux-for-watching-videos_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-hack-software-download_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-hack-apk-33-download_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/roblox-hackclub-2021_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/minecraft-bedrock-free-download-pc_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/roblox-hacks-com_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/how-to-get-infinite-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
font_00_sfnt_off00002e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E8C 22228 bytes
SHA-256: 576a2d6a19535267bebf5308e60a59eb4a4bbe94b16c159fc9b2148b1267672f
font_01_sfnt_off0000602d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x602D 18920 bytes
SHA-256: 9da234ecce238b6464ae2d803955a7dd5dbb8ba4c7986301bf6d09a8456bef63

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