Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87dcd2fc314aad5…

MALICIOUS

PDF

34.0 KB Created: 2021-07-06 07:20:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2f9263b022caefa6aa1244fbde3319ab SHA-1: 6b0a7976a56b9a5a1f2a65e059da7bb2ece742ec SHA-256: f87dcd2fc314aad5d723d88a235b851960a9f91aa35c6599a8fd74cb71b5f1ed
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game currency ('Robux') and hacks to entice users. It contains numerous links, including a primary redirector at http://netcdn.tw/app/431946152/bloxpage-free-robux-game-hack, which is associated with malicious infrastructure. The document also features a link farm pointing to other PDF files, likely for SEO manipulation to increase visibility of the scam. No scripts were extracted, but the primary attack vector is the redirection to malicious URLs.

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/bloxpage-free-robux-game-hack In PDF document text
    • http://perpus.ar-rum.ac.id/repository/roblox-cheat-codes-for-rocitizens_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/caught-my-girlfriend-cheating-on-me-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/a-website-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/instant-robux_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/cmaster-club-coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/hacks-para-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-hack-version-download_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/roblox-websites-that-give-free-roblox-robux-codes_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/free-roblox-survival-games_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/robux-hack-ios-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/unlimited-robux-hack-ios_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/hack-robux_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/best-free-catalog-items-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/get-free-robux-no-survey-no-download-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/comment-tlcharcher-un-cheat-sur-roblox-avec-explication_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/free-stuff-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/free-pets-on-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/how-to-get-free-robux-on-a-game_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/free-robux-generatere_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_off00002ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EF1 22160 bytes
SHA-256: d1ac5469a3b778636c14e2b82e33fb665e8db4f597c4ac22131564aef63bdf4e
font_01_sfnt_off00006030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6030 18968 bytes
SHA-256: 1b5123001528eb502e32e1473b5fef90b38f1688b53074051a1ff9b6b67f8f5e

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