Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e57420de1ff793…

MALICIOUS

PDF

40.9 KB Created: 2021-05-10 18:01:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4e484721afc0cf8fc9e9bc30b486deb7 SHA-1: 87eb589aebf51d25e1c7d4813a00632d217912db SHA-256: 83e57420de1ff793c32e0755ea2eac472cb5fd4b8eba26feb4702d2449d0c632
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple links to known malicious redirectors, disguised as "free generator" or "game hack" lures. The primary URL, https://netcdn.xyz/app/406889139/free-spins-on-coin-master-2021-ios-game-hack, is a critical finding. The document body and embedded URLs suggest a social engineering tactic to trick users into visiting potentially harmful sites, likely for further malware delivery or phishing. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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/free-spins-on-coin-master-2021-ios-game-hack In PDF document text
    • https://maquinasdetabaco.com/images/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://maquinasdetabaco.com/images/coin-master-hack-app-android-download_GM406889139.pdfIn PDF document text
    • https://maquinasdetabaco.com/images/are-there-any-coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • https://maquinasdetabaco.com/images/how-to-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://maquinasdetabaco.com/images/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • https://maquinasdetabaco.com/images/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • https://maquinasdetabaco.com/images/freespinandcoin-blogspot_GM406889139.pdfIn PDF document text
    • https://maquinasdetabaco.com/images/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://maquinasdetabaco.com/images/app-store-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://maquinasdetabaco.com/images/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://maquinasdetabaco.com/images/coin-master-free-download-pc_GM406889139.pdfIn PDF document text
    • https://maquinasdetabaco.com/images/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://maquinasdetabaco.com/images/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://maquinasdetabaco.com/images/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://maquinasdetabaco.com/images/free-roblox-outfits-2021_GM431946152.pdfIn PDF document text
    • https://www.urcouponsdeal.com/2019/03/coin-master-free-spin-and-coin-links.htmlIn 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_off00004495.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4495 24728 bytes
SHA-256: c966ccc97f91d337a93b5030ce102f29e8bffea8d610e350c4eaf41d17834b2d
font_01_sfnt_off00007de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE0 18288 bytes
SHA-256: 9fe1374c2a5f04ab05412f91fd2327b7ecdc71e8abb7b76c0a33ea1eb285afe1

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