Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec657902957d2f8…

MALICIOUS

PDF

37.0 KB Created: 2021-06-27 22:26:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e43b3ac31e14c5f299db10d57e0277a8 SHA-1: ed7298cc7e04accca938d5d31bc77277862eab10 SHA-256: fec657902957d2f8705625cab98dbb804a3964422ebdcd00d8ac72930022ce56
160 Risk Score

Malware Insights

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

The PDF document contains multiple links that redirect to a known malicious infrastructure, specifically advertising 'game hacks' and 'free generators'. The ML classifier strongly indicated maliciousness, and the document body, though partially garbled, contains references to these lures and associated URLs. The primary attack pattern involves luring the user to click these links, likely leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/roblox-2021-btools-hack-game-hack In PDF document text
    • https://cosmosocean.com.tw/upload/files/when-does-john-doe-hack-roblox_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/master-8-ball-pool-free-coins_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-free-spins-save_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-real-working_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-clothes-maker-roblox_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-look-cool-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-make-yourself-look-like-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/survival-games-roblox-cheats_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/hack-para-tener-robux-en-el-movil_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/https-wwwrobloxcom-catalog-keyword-freecategory-1direction-2_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-accs-free_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/minecraft-bedrock-download_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-coins-for-flip-master-online_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-got-talent-piano-hacks_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3754 23236 bytes
SHA-256: cc71b60f0cdb38ee05c39d139ce429616b9746a650598daff65fba7c6e7a4d57
font_01_sfnt_off00006b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B53 19164 bytes
SHA-256: 8be29fa371e4ee847dec2974dd1b854e04b3aee8ea9702f22987ded0ae85ada3

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