Malicious PDF — malware analysis report

Static analysis result for SHA-256 b196b1bbb011253a…

MALICIOUS

PDF

43.9 KB Created: 2021-05-14 05:31:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 75213879808e59ddef708a7a8c075cf3 SHA-1: f97043a06e662e4ba95d586300917b88fee16e31 SHA-256: b196b1bbb011253a2842e65c859ea0b1e3f1cbf75805945b9170868d2b847750
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 0.9969

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 https://netcdn.xyz/app/431946152/get-free-robux-info-game-hack PDF link annotation
    • https://www.e-starmagazine.com/uploads/files/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/coin-master-free-in-app-purchases-jailbreak_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/coin-master-free-spins-and-coins-generator_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/coin-master-free-spins-glitch_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/free-free-robux_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/free-money-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/robux-2021_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/coin-master-game-free_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/hack-coin-master-ios_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_off00004969.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4969 27964 bytes
SHA-256: 5d8e42694bea2939a8c69ad612509da528ab7b2605643590297a0b38d04acefe
font_01_sfnt_off000089fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89FD 18120 bytes
SHA-256: 6e6e8bb7c0e640fc67837f70826b1bbd381eb05acf75ec047415621944091573

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