Malicious PDF — malware analysis report

Static analysis result for SHA-256 1153a796749e310d…

MALICIOUS

PDF

34.3 KB Created: 2021-07-05 06:16:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: eae3b25487d630122d30c8b7179b74cf SHA-1: 676772d317d2592f321a7fc3aae9c6c390280a7f SHA-256: 1153a796749e310d9955950e0090d92c3cc337927a07007952cdeff973512247
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to malicious redirectors and link farms, disguised as 'free generators' or 'game hacks' for popular games. The primary lure is 'Can I Have Robux', directing users to a malicious URL. The document structure and embedded links strongly suggest a phishing or scam campaign aimed at tricking users into visiting malicious sites, likely for credential harvesting or further malware delivery.

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/can-i-have-robux-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/fb-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-online_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-and-tix-on-roblox-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-make-a-free-server-in-minecraft-java_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-spin-coin-master-new-link_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/village-4-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-no-verify_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-cheat-deutsch_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-free-adiidas_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-root-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/what-is-robux-in-roblox_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_off00002f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F59 22824 bytes
SHA-256: ec68ec1ccbe142b49991fdd1975c7a2c44da1e695516fece376c8b569104ee5f
font_01_sfnt_off000061df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61DF 18668 bytes
SHA-256: 1ae2abc7ddb7e11b0fef4f3892d9ba6710e883f112786b0bde5a806213b3f695

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