Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c65185e40c76042…

MALICIOUS

PDF

34.3 KB Created: 2021-07-06 19:17:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: cb89aca4955693fd2bc0e0d0d80525a7 SHA-1: aa9f55df2b2c3bca84fac97b89ef30006b4f0b16 SHA-256: 0c65185e40c760426f444c5ac07348ac44640525cf611272fdabbc0f6ebeeb24
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including one to a known malicious redirector, designed to lure users into clicking on game hack and free currency generators. The document body and heuristics indicate a scam or phishing attempt, likely to lead to a malicious website or download. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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-free-spins-save-game-hack In PDF document text
    • http://library.ulb.ac.id/repository/roblox-servers-that-give-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-50-tiktok-views_GM835599320.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-hack-your-friends-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-cheat-engine-pastebin_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/lucky-patcher-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-hack-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-hack-free-money_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-do-you-get-free-vbucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-a-free-vip-server-on-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-do-you-get-free-skins-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-do-you-get-roebucks_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/haktuts-coin-master-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/give-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-100-percent-real_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/best-free-roblox-plane-game_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-roblox-animation-codes_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-hack-account-bugmenot-wiki_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_off00002ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EF3 23240 bytes
SHA-256: a2734b71afa9ba0e92c2fe251e6a11a9713bfbb08499fb04ea6992ac550a2b4a
font_01_sfnt_off00006375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6375 18288 bytes
SHA-256: f64419199b4080c9b5b74d14bb4d3041b33e9c5b1581878cbb74ccdc781f789d

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