Malicious PDF — malware analysis report

Static analysis result for SHA-256 406de89bc383f7f4…

MALICIOUS

PDF

42.0 KB Created: 2021-05-13 05:14:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9e1c1e9973ada3bcc509cb6b98270035 SHA-1: 58c6e25bdaf7d1b5401e419a15d023517fd71fc2 SHA-256: 406de89bc383f7f4490b3b2a3e638b071b550fa961680c74c22887eb8cd42c9b
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users into clicking on what appear to be game hacks and generators. The primary link, https://netcdn.xyz/app/431946152/generator-robux-game-hack, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to similar lures and a large number of external PDF links, indicating a link farm strategy. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/431946152/generator-robux-game-hack In PDF document text
    • http://www.tdbaska.hr/files/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.tdbaska.hr/files/roblox-free-no-download_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/coin-master-free-in-app-purchases-jailbreak_GM406889139.pdfIn PDF document text
    • https://www.tdbaska.hr/files/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.tdbaska.hr/files/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/spin-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tdbaska.hr/files/minecraft-pc-download-free-full-version_GM479516143.pdfIn PDF document text
    • http://www.tdbaska.hr/files/minecraft-thumbnail-maker-free_GM479516143.pdfIn PDF document text
    • https://www.tdbaska.hr/files/how-to-get-free-clothes-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
    • https://www.tdbaska.hr/files/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • https://www.tdbaska.hr/files/coin-master-free-spin-link-daily_GM406889139.pdfIn PDF document text
    • https://www.tdbaska.hr/files/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.tdbaska.hr/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://www.tdbaska.hr/files/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://www.tdbaska.hr/files/free-minecraft-shaders_GM479516143.pdfIn PDF document text
    • https://www.tdbaska.hr/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/robux-survey_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_off00004ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AE3 24340 bytes
SHA-256: be4e4b43e508b423ff43b4c83f612a509ac7229ee4771589c5600f715ebca949
font_01_sfnt_off000081db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81DB 18184 bytes
SHA-256: b4ce75e5ef7529b15199eebab458c6aae3f76f2df33fea1dae4b183417bcc22e

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