Malicious PDF — malware analysis report

Static analysis result for SHA-256 5451e54496a5677c…

MALICIOUS

PDF

43.4 KB Created: 2021-05-12 20:31:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c7c43db4c8992c892067581f3f775629 SHA-1: deee793fabe74359bef749e50c829970931be011 SHA-256: 5451e54496a5677c5c7ed23c49540c5c8c7fc51f8a1809920bf582eac89fe197
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirector infrastructure, specifically advertising "free generators" and "game hacks" to lure victims. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the embedded URLs and the nature of the lures strongly suggest a phishing or scamming attempt designed to lead users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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-hack-apk-game-hack In PDF document text
    • http://hilro.co.za/images/how-you-get-robux_GM431946152.pdfIn PDF document text
    • http://hilro.co.za/images/coin-master-free-spins-link-2021-march_GM406889139.pdfIn PDF document text
    • http://hilro.co.za/images/claim-roblox_GM431946152.pdfIn PDF document text
    • http://hilro.co.za/images/coin-master-free-spin-and-coins-links-home_GM406889139.pdfIn PDF document text
    • http://hilro.co.za/images/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://hilro.co.za/images/coin-drop-master-free_GM406889139.pdfIn PDF document text
    • http://hilro.co.za/images/synapse-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://hilro.co.za/images/free-robux-pin-codes_GM431946152.pdfIn PDF document text
    • http://hilro.co.za/images/coin-master-spins-gratis_GM406889139.pdfIn PDF document text
    • http://hilro.co.za/images/coin-master-hack-ios-10_GM406889139.pdfIn PDF document text
    • http://hilro.co.za/images/coin-master-hack-twitter_GM406889139.pdfIn PDF document text
    • http://hilro.co.za/images/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://hilro.co.za/images/rich-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://hilro.co.za/images/minecraft-free-computer-game_GM479516143.pdfIn PDF document text
    • http://hilro.co.za/images/robux-generator-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://hilro.co.za/images/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://hilro.co.za/images/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://hilro.co.za/images/how-to-get-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://hilro.co.za/images/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • http://hilro.co.za/images/coin-master-hack-software_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000464f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x464F 24328 bytes
SHA-256: 3b3d574ed57e46f5bf63fa1b15468d320306f2e3e80741bae71317a879b90290
font_01_sfnt_off00007e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E06 2944 bytes
SHA-256: e8dca988325d5b5adea380508eed68725fcb814536e93cd420f224b7166adc23
font_02_sfnt_off00008831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8831 17892 bytes
SHA-256: f939fda97690d6a809d743b342add8ec97984f5e978608423f32dd39679c4d64

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