Malicious PDF — malware analysis report

Static analysis result for SHA-256 f270dfa33ceb3c22…

MALICIOUS

PDF

34.9 KB Created: 2021-07-06 01:42:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0daff6917afeb675d6715328a437414c SHA-1: 67e842a900db5ad31d3e2c676990e9a77db8bb55 SHA-256: f270dfa33ceb3c22720c5953ff430d59ce3a75ca788978b1c736c7366dff0e45
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and sites offering game hacks and cheats, indicating a lure for users to download potentially malicious content. The presence of a 'free generator' lure and the ML classifier's high confidence score strongly suggest malicious intent. Although no scripts were explicitly extracted, the document's structure and embedded URLs point towards a phishing or social engineering attack.

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/coin-master-hack-pro-gamers-game-hack In PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/best-site-for-free-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/2021-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/roblox-mad-city-hack-script_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/roblox-r-cheats-2021_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/coin-master-hack-facebook_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/how-to-get-free-roblox-items_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/roblox-hack-robux-infinito-download-pc_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/robux-rewards_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/cheat-roblox-jailbreak-money-give_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/roblox-login-hack_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/roblox-robux-cheat-youtbe_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/roblox-free-vip-gta-5_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/how-to-get-free-robux-not-a-scam_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
stream_002_off000030d0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30D0 23464 bytes
SHA-256: 426b67534b3f7f180934889f11938f0b5c6f37797176e019b2d6d5bf2961cf70
font_01_sfnt_off0000659d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x659D 18416 bytes
SHA-256: 42eb204123647df6f85ca188dd99f1d84b9bafa3d0fb5c7709fcc50fb0944608

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