Malicious PDF — malware analysis report

Static analysis result for SHA-256 927c849533724dab…

MALICIOUS

PDF

49.1 KB Created: 2021-05-18 05:33:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 2a8495e137a35a14397ce48000e958d9 SHA-1: 06cf5062ed069c916875db14ca488f43dfbd9f9a SHA-256: 927c849533724dabc1a2f85ad32ab07b619ae0c5be4c79cd4614375531809118
182 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a security-bypass lure. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.xyz/app/431946152/how-to-hack-roblox-games-game-hack PDF link annotation
    • http://www.donjastubica.hr/files/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/free-spin-appscoin-master_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/coin-master-free-rewards-link_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/coin-master-free-link-blogspot_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/coin-master-free-spons-apk-2021_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/real-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/twitter-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/free-domain-for-minecraft-server_GM479516143.pdfIn PDF document text
    • http://www.donjastubica.hr/files/free-accessories-roblox_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/how-do-you-hack-for-2021000-coins-on-flip-master_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/fighting-free-card-coin-master_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/roblox-games-free_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/apk-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://www.donjastubica.hr/files/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/is-coin-master-hacks-safe_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/moonactive-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/coin-master-code-for-free-spins_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a28.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A28 38056 bytes
SHA-256: 3f05892f2780673129e32756fa4ba31e5521eb57f499ab9bfa2b52f992f14ba0
font_01_sfnt_off00009cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CEF 18608 bytes
SHA-256: f0530f62cc2e234d68a11618bd0f649c02fcf1ebf2f14054a2e3aba439076e74

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