Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c79626b65f7a21…

MALICIOUS

PDF

34.7 KB Created: 2021-07-03 20:33:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: edaa6be825fefbf1b33263ac9f9ce1d4 SHA-1: 6190dfacfaf3cc483d910e3927797efdd1ebb15b SHA-256: 20c79626b65f7a21ac2eabf15713bd2798bd7945174ac0bc1536c8435f519d9b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. 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 0.9980

Heuristics 5

  • 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.
  • 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 http://netcdn.tw/app/431946152/what-is-robux-in-roblox-game-hack PDF link annotation
    • https://www.donjastubica.hr/files/free-coin-master-spins-blogger_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • https://www.donjastubica.hr/files/how-t-oget-free-robux_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/free-coins-coin-master-link-today_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/minecraft-tiktok-hacks_GM479516143.pdfIn PDF document text
    • https://www.donjastubica.hr/files/toolbox-for-minecraft-pe-ios_GM479516143.pdfIn PDF document text
    • http://www.donjastubica.hr/files/how-to-hack-key-login-roblox-exploit_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/how-to-get-free-hair-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/2021-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/free-minecraft-java-edition-account_GM479516143.pdfIn PDF document text
    • https://www.donjastubica.hr/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/roblox-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/roblox-old-guest-shirt-free_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/how-to-tiktok-hands-free_GM835599320.pdfIn PDF document text
    • http://www.donjastubica.hr/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/roblox-free-skin_GM431946152.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
font_00_sfnt_off00003110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3110 22272 bytes
SHA-256: 4896d4f47b6a0c297528a520afc524a78078313aa44e6acab982381fcd94a55d
font_01_sfnt_off00006261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6261 19092 bytes
SHA-256: 94a1f2859afb923117d52f489ea15a0d1f58c1dcaae9f6452d2b7a2e70625d67

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