Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e7faac374b5b9b…

MALICIOUS

PDF

51.4 KB Created: 2021-06-03 23:21:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 35a78bac7b5873426c98d37e29f00a58 SHA-1: 3190d20663480345e3febf9d20f22641b111170e SHA-256: 78e7faac374b5b9b538644ac471ed0b7ed161ef529d73de98dcf50a46b55be0c
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and a large number of SEO-optimized PDF links, likely intended to drive traffic to malicious sites. The primary redirector URL points to a 'free generator / game hack' lure, indicating a scam or phishing attempt. The document body, though heavily obfuscated, contains references to game hacks and URLs consistent with this lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9724

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.online/app/431946152/original-roblox-game-hack In PDF document text
    • http://library.futureuniversity.com/repository/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/pokemon-go-free-2021_GM1094591345.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/tiktok-free-no-sign-in_GM835599320.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-tiktok-likes-no-survey_GM835599320.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-spins-in-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-minecraft-texture-packs-java_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/minecraft-pe-017-0-apk-free-download-android_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-get-a-free-raid-pass_GM1094591345.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-robux-download_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/can-you-still-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052e6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52E6 29652 bytes
SHA-256: 81a1a26b0b431b5295e56c2ad29b136e9e4b5c405a57eb4c474d57a684f3a9a7
font_01_sfnt_off000095bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95BD 4660 bytes
SHA-256: 465209964a09586ac5022a8b8e85d53299c19051a953d4aa9891341d9cc85b22
font_02_sfnt_off0000a5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5D1 18420 bytes
SHA-256: 07637e756c9e476f76e6aac07d93055443532b6fc7e48bcbb320a9c3212a4919