Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4833daf614cef93…

MALICIOUS

PDF

42.8 KB Created: 2021-05-15 23:00:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 498df8f3581c4110a19172e8688b248c SHA-1: 34552751d1b8cce6d79b0c91c9450b9316e952ed SHA-256: b4833daf614cef933b7992a2d7720c8daa7fee9e1cbcebc68c5cc387964719bc
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users to websites offering 'free game hacks' or currency. The primary link, https://netcdn.xyz/app/406889139/coin-master-free-spins-link-game-hack, is identified as a malicious redirector. The document body and embedded links suggest a scam or phishing attempt to drive traffic to potentially malicious or ad-heavy sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • 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.
  • 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-spins-link-game-hack In PDF document text
    • https://newenglandafs.com/images/how-to-get-free-roebucks-without-verification_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/free-coins-coin-master-link-today_GM406889139.pdfIn PDF document text
    • https://newenglandafs.com/images/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/how-to-change-your-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/roblox-bux-free_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/get-robux_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/coin-master-35-16-hack-apk_GM406889139.pdfIn PDF document text
    • https://newenglandafs.com/images/robux-robux_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/coinmaster-free-cards_GM406889139.pdfIn PDF document text
    • https://newenglandafs.com/images/coin-master-free-spin-and-coin-link-2021-today_GM406889139.pdfIn PDF document text
    • https://newenglandafs.com/images/coin-master-hack-ios-jailbreak_GM406889139.pdfIn PDF document text
    • https://newenglandafs.com/images/coin-master-hack-no-survey-2021_GM406889139.pdfIn PDF document text
    • https://newenglandafs.com/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/roblox-microsoft-rewards_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://newenglandafs.com/images/coin-master-extra-spins_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_off00004c04.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C04 25212 bytes
SHA-256: 6beebe79090719914d7b30686de25324cec6c68ebfaf6fe8ee6ffa076e6f2c95
font_01_sfnt_off0000859d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x859D 18056 bytes
SHA-256: a4f33549350803e8a819cbfad6b4ff3cdc0b302ceab74af9f2f663eab6bd9ec0

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