Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8b67004d7b404a…

MALICIOUS

PDF

43.4 KB Created: 2021-05-11 03:16:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a35d7574ccb30d7bebc7a55a1e6b7a32 SHA-1: 361be153afe5c1c2bf3491cc04665b51a717bca0 SHA-256: ab8b67004d7b404a53f8c3eeb4620a4769b8fcda5c2f64f24537c5343b78f2e1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirector infrastructure, specifically promoting game hacks and generators. The document body and embedded URLs strongly suggest a phishing or scam attempt designed to lure users to malicious sites. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/can-you-really-hack-coin-master-game-hack In PDF document text
    • http://rexingen.info/images/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://rexingen.info/images/hackear-coin-master-android_GM406889139.pdfIn PDF document text
    • http://rexingen.info/images/app-master_GM406889139.pdfIn PDF document text
    • http://rexingen.info/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://rexingen.info/images/daily-coin-master-free-spin-link-facebook_GM406889139.pdfIn PDF document text
    • http://rexingen.info/images/download-hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://rexingen.info/images/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://rexingen.info/images/roblox-download_GM431946152.pdfIn PDF document text
    • http://rexingen.info/images/how-to-change-your-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://rexingen.info/images/coin-master-card-collection-hack-2021_GM406889139.pdfIn PDF document text
    • http://rexingen.info/images/coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://rexingen.info/images/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://rexingen.info/images/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • http://rexingen.info/images/robux-download_GM431946152.pdfIn PDF document text
    • http://rexingen.info/images/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://rexingen.info/images/how-do-you-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://rexingen.info/images/coin-master-get-free-spins_GM406889139.pdfIn PDF document text
    • http://rexingen.info/images/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://rexingen.info/images/how-to-get-free-pets-in-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • http://rexingen.info/images/coin-master-free-daily-spins-and-coins_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_off000048b1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48B1 27344 bytes
SHA-256: 35fefc7380faa8bc647a0c8a7ce860179bea8d8b95b189508ad2367c0f1927cf
font_01_sfnt_off00008775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8775 18272 bytes
SHA-256: 673297a7d6d275bbcd364c291cde02cd01d24458221a0908b56fbaba527eed30

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