Malicious PDF — malware analysis report

Static analysis result for SHA-256 823e675a82916887…

MALICIOUS

PDF

33.8 KB Created: 2021-07-03 22:15:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 83aed30beaa64eae443e63c241068168 SHA-1: 22aedcaf625d52509f74fc1662dcd3953c17e9bc SHA-256: 823e675a8291688715d584d887abbc9b6694ec5c43539fcd6ebeb101b414595d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free generators' and 'game hacks' for popular games like Roblox. The document body and heuristics indicate a lure to external sites, likely for malware distribution or phishing. The presence of numerous PDF links suggests a link farm designed to attract traffic.

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/roblox-character-free-game-hack In PDF document text
    • https://elearning.manicp.sch.id/__statics/gudangsoal/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.manicp.sch.id/__statics/gudangsoal/files/coin-master-free-coins-amp_GM406889139.pdfIn PDF document text
    • https://elearning.manicp.sch.id/__statics/gudangsoal/files/i-got-hacked-but-i-want-my-account-back-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.manicp.sch.id/__statics/gudangsoal/files/roblox-how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://elearning.manicp.sch.id/__statics/gudangsoal/files/free-robux-download-one-app_GM431946152.pdfIn PDF document text
    • https://elearning.manicp.sch.id/__statics/gudangsoal/files/do-the-obby-for-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.manicp.sch.id/__statics/gudangsoal/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.manicp.sch.id/__statics/gudangsoal/files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://elearning.manicp.sch.id/__statics/gudangsoal/files/descargar-menu-de-hacks-para-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.manicp.sch.id/__statics/gudangsoal/files/chrome-web-store-roblox-hack_GM431946152.pdfIn PDF document text
    • https://elearning.manicp.sch.id/__statics/gudangsoal/files/xsos-hack-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.manicp.sch.id/__statics/gudangsoal/files/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://elearning.manicp.sch.id/__statics/gudangsoal/files/downloadable-hacks-for-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.manicp.sch.id/__statics/gudangsoal/files/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.manicp.sch.id/__statics/gudangsoal/files/dantdm-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.manicp.sch.id/__statics/gudangsoal/files/dragon-ball-fury-roblox-hack_GM431946152.pdfIn PDF document text
    • https://elearning.manicp.sch.id/__statics/gudangsoal/files/do-you-get-windows-10-minecraft-for-free-with-java_GM479516143.pdfIn PDF document text
    • https://elearning.manicp.sch.id/__statics/gudangsoal/files/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.manicp.sch.id/__statics/gudangsoal/files/free-gifts-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.manicp.sch.id/__statics/gudangsoal/files/robloxbux-us-generator_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_off00002e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E72 22048 bytes
SHA-256: fc76b318e7c8c3ce5afdc1995771d0157d17d93737cb7140f5a4ffa3a9df12bd
font_01_sfnt_off00005f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3D 18920 bytes
SHA-256: b5474294296d9f5b9ea12a54036d97a64d26d44eeb49bdd78dad108d1826d115

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