Malicious PDF — malware analysis report

Static analysis result for SHA-256 90eede366e2ef4f8…

MALICIOUS

PDF

36.7 KB Created: 2021-07-06 02:13:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: ff10e55d8ba63d264a54d95d27da6185 SHA-1: 81e4788c5de35c2b77c64cad904579d61d4818e3 SHA-256: 90eede366e2ef4f86e20d1143c2be03c7b6c61028560ffae66a1c57685565799
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising game hacks and cheats. The heuristic firings indicate a malicious redirector lure and a general ML classification of maliciousness. The document body, though partially corrupted, contains URLs that are consistent with the lure of obtaining free in-game currency or cheats, likely leading to further malware downloads or phishing attempts.

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.
  • 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/406889139/how-to-get-free-coins-on-flip-master-game-hack In PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-robux-no-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/download-free-roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/can-you-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-hacks-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/granny-roblox-hack-script_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/fairy-tail-ultimate-adventure-roblox-how-to-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-coin-master-spins-blogger_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-owner-admin-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-cheat-in-dragon-ball-rage-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-shirt-for-kids-free-shipping_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-spin-link-daily_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-fast-robux-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/what-to-do-if-your-roblox-account-gets-hacked_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/names-of-roblox-hack-scripts_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_off000038e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x38E6 23120 bytes
SHA-256: 1f358e6d3c19bea721996c11fe4688e59a2e6d140ea257a562b9278a4c00c1bb
font_01_sfnt_off00006cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB4 18412 bytes
SHA-256: a3f222d31def4247f09cb39abe9d6f493a080d6b52ebda4544bb665d808a25f3

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