Malicious PDF — malware analysis report

Static analysis result for SHA-256 34957c9e6b34d05b…

MALICIOUS

PDF

46.0 KB Created: 2021-06-10 22:50:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: accc86b1c4a204fd507400930a649eb8 SHA-1: ea603db75663f22d67c170d7dc2748cebf87a1e8 SHA-256: 34957c9e6b34d05b7a5d213e7b4af9f6c23bb73bd8c19c4b0f722a5a55ed740a
162 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, many of which are disguised as game hacks or generators. These links redirect to a large number of PDF files hosted on a domain that appears to be part of a link farm. The document's structure and the nature of the links suggest an attempt to manipulate search engine results or lead users to potentially malicious content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 6

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/ssuper-speed-hack-in-roblox-2021-game-hack PDF link annotation
    • http://reggieslockandkey.com/images/2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/pokemon-go-free-ultra-box_GM1094591345.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/roblox-roalye-high-how-to-get-multi-colours-for-free_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-spins-coin-master-links-blogger_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/best-way-to-get-robux_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/block-best-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
stream_004_off00005149.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5149 26380 bytes
SHA-256: fa291512670742d8d5739a83d8e97f559d14a12f066c5eaa0817ba70f29c2107
font_01_sfnt_off00008edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EDC 19076 bytes
SHA-256: 2ba5b780292dafc6669681bcb8e230bb3e85e86f107f649eb9e9c3e50c6b0dc8

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