Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6497dd86f6f83db…

MALICIOUS

PDF

32.9 KB Created: 2021-07-08 01:26:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bbdf203cb94a8b7cf5857ec135e5e3d5 SHA-1: 3cac9440df72eb7f2fabfff32a6a0b06e31b1c3c SHA-256: a6497dd86f6f83db576b08e85d3296f211171575bc62793e9f7ffe96758fe7eb
220 Risk Score

Malware Insights

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

This PDF document employs a lure of free in-game currency and hacks to trick users into clicking malicious links. It contains numerous links to redirectors and SEO link farms, including http://netcdn.tw/app/431946152/oprewards-free-robux-game-hack, which is flagged as a known malicious redirector. The document body and heuristics indicate a clear intent to drive traffic to potentially harmful external sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/oprewards-free-robux-game-hack In PDF document text
    • http://mbbs.hr/files/roblox-build-a-boat-for-treasure-free-vip-server_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-unlimited-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-the-best-shirts-on-roblox-free_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/dead-winter-roblox-credits-hack_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-roblox-hats-2021_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/tiktok-free-view-your-liked-videos_GM835599320.pdfIn PDF document text
    • https://mbbs.hr/files/pgsharp-pokemon-go-free-key_GM1094591345.pdfIn PDF document text
    • http://mbbs.hr/files/ultimate-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/minecraft-font-free_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/flee-the-facility-hack-roblox_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_off00002a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A03 22188 bytes
SHA-256: d4b1b6a0212e7ff1af16e2f79ad14e6597cfa88276094daec741baa4ec22cdba
font_01_sfnt_off00005b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B10 19228 bytes
SHA-256: 28d2551d9716c0c1f642d1de59876c155fe982ad5f1d32fc26186d5dbb125a3e

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