Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f958dfba728dbe2…

MALICIOUS

PDF

35.9 KB Created: 2021-07-05 07:31:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3fc9e90ab2eb83f57e8a616bb9ff8d20 SHA-1: df7ddf959283dfa200b8197281e3d53d955ade3c SHA-256: 7f958dfba728dbe276dbb68c5c2ace30faffc0bd80357059dde0c1a83041750c
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains multiple links to malicious redirectors and link farms, masquerading as generators for popular games like Coin Master and Roblox. The document body and heuristics indicate a lure for free game resources, which is a common social engineering tactic. The embedded URLs are designed to lead users to potentially harmful websites, likely for further malware delivery or phishing.

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/406889139/coin-master-hack-cheat-generator-coins-and-spins-unlimited-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-roblox-avatar-ideas_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/app-hack-online-roblox-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-hack-someone-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-game-download-free_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robux-hack-text-verification_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/is-roblox-free-on-pc_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-coin-master-account_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-hack-kostenlos_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/pokemon-go-free-team-change_GM1094591345.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-spins-daily-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-2021-without-verification_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/real-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-coins-on-coin-master-without-verification_GM406889139.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_off000033db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33DB 23036 bytes
SHA-256: 010a146e07d8837d747bac6119b0a513ae9eb2083288bd930ea26e30c4362fbb
font_01_sfnt_off00006792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6792 19040 bytes
SHA-256: 09a4b9d12a1f1ab4c4aeba1be201f879aff747a29176e72dedab5c8f64e8bae3

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