Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e33413f66651ba…

MALICIOUS

PDF

33.7 KB Created: 2021-07-04 20:51:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: aa69ae85ffec0a89ec5c395399f6e92f SHA-1: 8f5b5643aeaadd3389159f46546b516828b8dc39 SHA-256: 53e33413f66651bacbf88f8fc74a2b2d527decc09858d8514b05463cd7d88be9
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to free Robux and game hacks, as indicated by the document body and multiple heuristic firings. It contains numerous links to redirectors and a link farm, suggesting an attempt to drive traffic to malicious or scam-related websites. The ML classifier strongly supports the malicious verdict.

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/apps-to-get-free-robux-game-hack In PDF document text
    • http://perpus.ar-rum.ac.id/repository/cheats-for-dayz-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/how-to-get-free-robux-in-one-minute_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/roblox-hack-tool-game-android_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/comment-cheat-sur-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/hack-robux-2021-android_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/roblox-phantom-forces-hack-free_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/room-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/how-to-get-free-robux-100-real-plus-proof-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/www-roblox-cheat-u_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/free-items-in-roblox-catalog-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/free-gift-card-codes-facebook-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-instagram-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/claimrobux-net_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/badge-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/tricky-nicky-how-to-get-free-robux_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_off00002fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FB3 21352 bytes
SHA-256: ef2c1a330f62c84673954a1683b3fb3c3e2122d45a87b1bc85ed7d61c978e03f
font_01_sfnt_off00005e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E6A 18996 bytes
SHA-256: 5c2d20fe84271232cdb725bf1ee573f6c2a82921a8e85a5edc805d3c36d3e91e

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