Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f4c9c4171364d1…

MALICIOUS

PDF

42.1 KB Created: 2021-05-17 22:16:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 97bd87211f41d069075b59b6219074ca SHA-1: 7a5c69c12c987f4a3cbebfba0827945e6fd4ece1 SHA-256: 25f4c9c4171364d1409075bf41c7cbd0c2fbbc73087e717eb9acfc0f04a59b26
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure related to game hacks and free currency to entice users. It contains multiple embedded links that redirect to known malicious infrastructure, specifically targeting popular games like Coin Master and Roblox. The ML classifier strongly indicated maliciousness, and the presence of numerous redirector links reinforces this assessment.

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-2021-free-spins-link-blogspot-game-hack In PDF document text
    • https://www.les-sp.org/images/game-give-free-robux_GM431946152.pdfIn PDF document text
    • https://www.les-sp.org/images/get-robux-com_GM431946152.pdfIn PDF document text
    • https://www.les-sp.org/images/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • https://www.les-sp.org/images/robux-websites-that-work_GM431946152.pdfIn PDF document text
    • https://www.les-sp.org/images/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.les-sp.org/images/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://www.les-sp.org/images/free-attacks-coin-master_GM406889139.pdfIn PDF document text
    • https://www.les-sp.org/images/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • https://www.les-sp.org/images/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.les-sp.org/images/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • https://www.les-sp.org/images/wurst-112-2_GM479516143.pdfIn PDF document text
    • https://www.les-sp.org/images/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • https://www.les-sp.org/images/coin-master-spin-link-2021_GM406889139.pdfIn PDF document text
    • https://www.les-sp.org/images/free-minecraft-skins-java_GM479516143.pdfIn PDF document text
    • https://www.les-sp.org/images/online-coin-master-hack-here_GM406889139.pdfIn PDF document text
    • https://www.les-sp.org/images/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • https://www.les-sp.org/images/coin-master-village-cost_GM406889139.pdfIn PDF document text
    • https://www.les-sp.org/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.les-sp.org/images/free-spin-coin-master-app-download_GM406889139.pdfIn PDF document text
    • https://www.les-sp.org/images/coin-master-free-spins-cheat-deutsch_GM406889139.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_off00004998.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4998 23984 bytes
SHA-256: 68efaddc835fdbafdf7437c28a09ad1f43ed92b42ac2629c4977fb9f0b61f041
font_01_sfnt_off00007fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB1 19036 bytes
SHA-256: 29484b4ebf3793c9706388e12a4eb2d5c1ba7d7e7655f6e92dea7caed4d0fe01

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