Malicious PDF — malware analysis report

Static analysis result for SHA-256 363d2c1deb96eea1…

MALICIOUS

PDF

33.8 KB Created: 2021-07-09 19:02:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 17d286ed9ba85d79fa8988e1ea8891cd SHA-1: fd81c284cf8c37607732c78a67cfc773a592e735 SHA-256: 363d2c1deb96eea1f36c2de75479656142836784adbf7156b5fba7c2d5ddeb9b
220 Risk Score

Malware Insights

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

This PDF document is designed as a lure, using game hack and free currency themes to entice users to click on links. The primary link directs to a malicious redirector infrastructure, which in turn hosts a large collection of SEO-optimized PDF files. These secondary PDFs likely serve as a link farm or further redirection to malicious content, indicating a multi-stage distribution or phishing campaign.

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/479516143/cool-minecraft-hacks-game-hack In PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-spins-link-2021-march_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-v3rmillion-khol-admin-hack_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-mast-hacks_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/pokemon-go-free-quest-rewards_GM1094591345.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-hack-100-working_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-spins-5-10-2021_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-execute-my-hack-scripts-in-roblox_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/online-coin-master-free-spin-app_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-free-vip-server-jailbreak-2021_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/weird-roblox_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-spin-codes-coin-master_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-bleach-soul-of-end-hack_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/inf-currency-in-roblox-games-hack_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-play-now-for-free_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-spins-generator_GM406889139.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_off00002ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FF0 22436 bytes
SHA-256: 509df3634eda32e517ad8b56d708fdc183bc4aa0abcddc8dbc6938a1614b0e9c
font_01_sfnt_off000061c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61C9 18240 bytes
SHA-256: 1c98bc36042c0615650adcd4002099b1bf58f46cf651dff08176303f69938fe5

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