Malicious PDF — malware analysis report

Static analysis result for SHA-256 244b339e86e50c5f…

MALICIOUS

PDF

43.0 KB Created: 2021-05-12 07:31:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6d16c3a12995fd156b624dbefa7883ad SHA-1: 2b44a6576254726c36b9cbf378e7f5911e40b6ac SHA-256: 244b339e86e50c5fcf838c6de8c3d70aeb1e7c5c6623a1475542243981bebeb2
182 Risk Score

Malware Insights

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

The PDF contains numerous links to websites offering game hacks and gift card generators, indicative of a link farm or SEO manipulation tactic. The 'SE_CLICKFIX' heuristic suggests the document may also instruct users to execute commands, further increasing the risk. While no specific malware family is identified, the pattern points towards social engineering to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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/479516143/how-to-get-a-free-minecraft-server-game-hack PDF link annotation
    • https://www.knjizara-harfa.rs/files/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-free-pets-in-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-free-spins-today-39_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-free-stuff-links_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/hack-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-free-spin-and-coin-link-2021-today_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-free-spins-and-cards_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-minecraft-client_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/apps-to-get-free-robux_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
stream_003_off00004cc9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CC9 25244 bytes
SHA-256: 84a26ae29acb1cac956989e95cffbedac371ed6f59242223422fa6a404e04e9b
font_01_sfnt_off000086b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86B9 17988 bytes
SHA-256: 888c9dccd83fb0c13f9447925305c3d56d9429efcbe621f5ab8e9b5d24de1b14

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