Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57a7a55b826aea0…

MALICIOUS

PDF

45.2 KB Created: 2021-05-11 16:36:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: dc14ed843d006c01a700d93c6ead299f SHA-1: e9da10c48b8376326bd55ac9ce8a2b4baa519dec SHA-256: c57a7a55b826aea02d126e4095e18f6c1043f4b94e6f1ae6b9785b613b3474a3
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 https://netcdn.xyz/app/479516143/how-to-get-creative-mode-in-minecraft-server-hack-game-hack PDF link annotation
    • http://xn--80aciiv6azczc.xn--p1ai/images/coin-master-free-spin-and-coin-link-app_GM406889139.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/earn-robux_GM431946152.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/coin-master-free-spin-and-trading-group_GM406889139.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/how-can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/coin-master-spin-hack-pc_GM406889139.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/minecraft-free-download-mobile_GM479516143.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/coin-master-free-spins-through-coin-pop_GM406889139.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/hack-coin-master-android_GM406889139.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/www-coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/coin-master_GM406889139.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/mcpe-master-unlimited-coins-free-download_GM406889139.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/coin-master-game-hack-link_GM406889139.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/free-spins-coin-master-november-2021_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_off00004cb6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CB6 29816 bytes
SHA-256: 65ae7f0ced06c3adc3eb9b1897c2d3a9499f51c723c0a578cdbef0b80d394640
font_01_sfnt_off00008e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E5C 18332 bytes
SHA-256: b04b103692562b1630027eac5b017e7352fc4190b72d9da3724e53b3c4929e1c

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