Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c393282a4cecbd…

MALICIOUS

PDF

42.5 KB Created: 2021-05-11 06:02:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 7d74b99dc546a3568a7f800c7fc5a6e0 SHA-1: cd54ba4f25637ce443dafc57984d7571bc524b8a SHA-256: 21c393282a4cecbd34aec8ec71df18185a23e3f3c2ea17d956615fd60997fb61
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users to external sites, masquerading as generators for game currency or hacks. The primary redirector URL is identified as malicious, and the document body contains numerous links to a link farm hosted on a compromised website. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a malicious redirection workflow, likely intended to lead users to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • 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.
  • 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.xyz/app/406889139/coin-master-rewards-game-hack In PDF document text
    • http://www.conservatoriolecce.it/images/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.conservatoriolecce.it/images/i-need-robux_GM431946152.pdfIn PDF document text
    • http://www.conservatoriolecce.it/images/hack-the-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.conservatoriolecce.it/images/free-coin-master-spins-link-download_GM406889139.pdfIn PDF document text
    • http://www.conservatoriolecce.it/images/coin-master-free-spins-link-ios_GM406889139.pdfIn PDF document text
    • http://www.conservatoriolecce.it/images/minecraft-bedrock-free-server-hosting_GM479516143.pdfIn PDF document text
    • http://www.conservatoriolecce.it/images/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://www.conservatoriolecce.it/images/minecraft-pe-016-0-apk-download-free_GM479516143.pdfIn PDF document text
    • http://www.conservatoriolecce.it/images/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.conservatoriolecce.it/images/hack-crack-for-coin-master-currency_GM406889139.pdfIn PDF document text
    • http://www.conservatoriolecce.it/images/www-robux-com_GM431946152.pdfIn PDF document text
    • http://www.conservatoriolecce.it/images/how-to-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.conservatoriolecce.it/images/coin-master-free-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://www.conservatoriolecce.it/images/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.conservatoriolecce.it/images/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://www.conservatoriolecce.it/images/avatar-de-roblox_GM431946152.pdfIn PDF document text
    • http://www.conservatoriolecce.it/images/coin-master-free-gold-cards_GM406889139.pdfIn PDF document text
    • http://www.conservatoriolecce.it/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.conservatoriolecce.it/images/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.conservatoriolecce.it/images/how-to-get-free-cards-sets-for-coin-master_GM406889139.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_003_off00004b77.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B77 24876 bytes
SHA-256: a7c2aaeeb32445ea564255a26a4fc5c9b19a3e0892e7d37144463099d02da6a6
font_01_sfnt_off000084dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84DC 17884 bytes
SHA-256: acbd2960432ed6aaee9cffad063da1b3d43b5b4e200ce15de4e80cb136e5b59b

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