Malicious PDF — malware analysis report

Static analysis result for SHA-256 318dfd51ddf78b13…

MALICIOUS

PDF

31.3 KB Created: 2021-07-05 16:32:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: cd0e08d6c7e45c5995bcf4eb67f1a5a4 SHA-1: d64d520ec28c2846b0c32e5253d9d623026c2075 SHA-256: 318dfd51ddf78b13d5e1a04d918cb8b04cfc57444889d00a251f91d2965964aa
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to redirectors and potentially malicious sites, disguised as "free generators" or "game hacks" for popular games. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it links to known malicious infrastructure. The document body explicitly contains the primary malicious URL, suggesting a lure to a site that likely hosts further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9774

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/479516143/minecraft-alt-accounts-free-game-hack In PDF document text
    • http://perpustakaan.idia.ac.id/repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-free-spin-link-twitter_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-free-spons-apk-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-free-coins-link-2021-deutsch_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/blocks-of-war-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/new-free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/easy-points-gg_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/online-coin-master-hack-here_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/robux-earning-websites_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-hack-without-verify_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/how-to-hack-a-minecraft-account_GM479516143.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/roblox-free-download-for-windows-7_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-free-food_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/get-me-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_off00002932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2932 21488 bytes
SHA-256: 67f5284129834477fa7c5876a79651f0ecd58e04e222db4fdef946c37213939b
font_01_sfnt_off00005805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5805 18212 bytes
SHA-256: 79167943b664c57080b7558835257354cfd56d5428e37e62e961791e2f613c27

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