Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d4f14497c8e883…

MALICIOUS

PDF

42.0 KB Created: 2021-05-13 03:35:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5f43de460f1e2a2ee48b474414617545 SHA-1: 40b89d3125b8b42baa80d47ba0748f6fa1d52add SHA-256: a2d4f14497c8e88399522837e7504102f268ca9fa7a1a924c55b23b0d3e81b22
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous links to external websites, many of which are hosted on domains associated with link farms and SEO manipulation. The primary lure appears to be 'game hacks' for popular mobile games like Coin Master, suggesting a phishing or malware distribution attempt. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs points towards an attempt to redirect users to potentially harmful content.

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/406889139/how-to-hack-coin-master-using-es-file-game-hack PDF link annotation
    • http://gops.pruszczgdanski.pl/images/coin-master-games-hack_GM406889139.pdfIn PDF document text
    • http://gops.pruszczgdanski.pl/images/extra-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://gops.pruszczgdanski.pl/images/free-roblox-groups_GM431946152.pdfIn PDF document text
    • http://gops.pruszczgdanski.pl/images/coin-master-hack-apk-with-fb-login-2021_GM406889139.pdfIn PDF document text
    • http://gops.pruszczgdanski.pl/images/synapse-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://gops.pruszczgdanski.pl/images/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://gops.pruszczgdanski.pl/images/how-to-hack-someones-minecraft-account_GM479516143.pdfIn PDF document text
    • http://gops.pruszczgdanski.pl/images/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://gops.pruszczgdanski.pl/images/how-to-get-free-spins-on-coin-master-android_GM406889139.pdfIn PDF document text
    • http://gops.pruszczgdanski.pl/images/how-to-get-daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://gops.pruszczgdanski.pl/images/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://gops.pruszczgdanski.pl/images/minecraft-free-download-android-apk-014-0_GM479516143.pdfIn PDF document text
    • http://gops.pruszczgdanski.pl/images/minecraft-win-10-free_GM479516143.pdfIn PDF document text
    • http://gops.pruszczgdanski.pl/images/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://gops.pruszczgdanski.pl/images/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://gops.pruszczgdanski.pl/images/free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://gops.pruszczgdanski.pl/images/coin-master-stop-attack-hack_GM406889139.pdfIn PDF document text
    • http://gops.pruszczgdanski.pl/images/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://gops.pruszczgdanski.pl/images/microsoft-robux_GM431946152.pdfIn PDF document text
    • http://gops.pruszczgdanski.pl/images/coin-master-free-spins-link-today_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_off000048d7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48D7 24380 bytes
SHA-256: f690bc3d49a06d87cfb5ccba4313928519a177fb88cffd3543a868473ec31275
font_01_sfnt_off000080d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80D8 18592 bytes
SHA-256: 7b6829f0c912f355393962c39643cd2cadf5d604c17bb92301d7763a729473f1

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