Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73756c334344157…

MALICIOUS

PDF

42.9 KB Created: 2021-05-19 19:09:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4d41e81de7204fe272da082c6fcbfec8 SHA-1: 545934bd84bdaeb837acb048e7a4157258bd3774 SHA-256: a73756c33434415704b8ea01c0d89f843c718ec6143f51cfc482dca6c31eaf17
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of free game currency or hacks. The ML classifier also flagged this PDF as malicious. The embedded links likely lead to further malicious content or phishing pages, indicating a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/coin-master-free-spin-and-coin-link-today-game-hack In PDF document text
    • http://kermas.eu/images/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/coin-master-hack-xyz-2021_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/minecraft-story-mode-free_GM479516143.pdfIn PDF document text
    • http://kermas.eu/images/coin-master-free-spin-and-trading-group_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/rewards-roblox-com_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • http://kermas.eu/images/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/coin-master-email-free-spins_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/how-to-get-free-pet-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/wurst-115_GM479516143.pdfIn PDF document text
    • http://kermas.eu/images/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/rare-free-links-to-coin-master_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/coin-master-hack-ios-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_off00004b6f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B6F 24900 bytes
SHA-256: 7d53ae65cd83a19d5958a24f610d115b508dc680bf81a8c004a8c4f67858c7d8
font_01_sfnt_off000084c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84C8 18412 bytes
SHA-256: 5606d742d49c2f618a839db89fb2f395f675f912dcc06d31cfc3972fb9700339

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