Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3aa602e5b281d4…

MALICIOUS

PDF

42.5 KB Created: 2021-05-18 04:45:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 67704da58266a21fde8c6e1c4ab12014 SHA-1: 138ac1850c6b3e125c365db638bc212a963584e2 SHA-256: 4f3aa602e5b281d49350283db96872f78abcf0ae4c08b8ad0d215efa3633db59
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 0.9971

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/479516143/minecraft-for-laptop-free-game-hack PDF link annotation
    • http://nitetpl3.com/images/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • http://nitetpl3.com/images/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://nitetpl3.com/images/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://nitetpl3.com/images/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • http://nitetpl3.com/images/best-site-for-free-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://nitetpl3.com/images/minecraft-xbox-one-edition-digital-code-free_GM479516143.pdfIn PDF document text
    • http://nitetpl3.com/images/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • http://nitetpl3.com/images/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://nitetpl3.com/images/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://nitetpl3.com/images/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://nitetpl3.com/images/village-3-coin-master_GM406889139.pdfIn PDF document text
    • http://nitetpl3.com/images/cm-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://nitetpl3.com/images/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://nitetpl3.com/images/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://nitetpl3.com/images/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://nitetpl3.com/images/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://nitetpl3.com/images/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://nitetpl3.com/images/coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://nitetpl3.com/images/how-to-get-to-village-3-in-coin-master_GM406889139.pdfIn PDF document text
    • http://nitetpl3.com/images/free-robux-no-verification-2021-ios_GM431946152.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_off00004c6c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C6C 25088 bytes
SHA-256: a25049602fb043bf96d97d1350506f791cfdb414e460c5a8a4172e743d58d792
font_01_sfnt_off0000852e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x852E 17884 bytes
SHA-256: 9e24751bd8abf3c905aaa0f9e5c5b681bc9bef6aedb2106afbecb5aef0f6c4b9

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