Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc637f3da884712…

MALICIOUS

PDF

50.0 KB Created: 2021-06-10 18:22:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 0943ae9fc805da7d67455dc14ca4d8f6 SHA-1: d940ef3b019244990a0c8d317dc6d1d0a1eda9bb SHA-256: 3fc637f3da8847127a71bcf8e9dd6375da248cc7eb75b61ae5912fcd203db55c
280 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains multiple links to external resources, including a known malicious redirector, disguised as game hacks and generators. It also presents a fake CAPTCHA to trick users into interacting with the document, likely to initiate a download or exploit. The presence of numerous PDF links suggests a link farm designed to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 7

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.tw/app/431946152/roblox-driveblox-unlimited-money-cheat-engine-game-hack In PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-coins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-to-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/body-roblox_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/totally-free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/coin-master-free-coins-and-spins-group_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/freespinandcoinblogspotcom-2021-11-coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-robux-key_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/coin-master-free-spins-glitch_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000528e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x528E 27436 bytes
SHA-256: 91b397217e47885d1b8a02f0ad6e29995ffdd7389ef0d0f0bbbcfbcb2762e53c
font_01_sfnt_off000091e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91E8 2896 bytes
SHA-256: c36d2cb6099ad4fae573485dcdeea5e8bce2dc409ad1d05a849d573100f96601
font_02_sfnt_off00009be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BE5 19968 bytes
SHA-256: b002e749a6d520bb359c0c44fe793470eb536132c70f0c56bf3c03aac0aaf236

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