Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b91efbcd939533…

MALICIOUS

PDF

45.5 KB Created: 2021-05-16 07:03:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 405fc88a9fd1664072f6d5d615d07820 SHA-1: 51cb8477e81c5a3dc3f8e1c8b61717d0cbc48255 SHA-256: 25b91efbcd93953388611252eb5111a61f25455507abab36430d1af69f7b0160
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to known malicious redirectors, specifically disguised as 'game hacks' and 'giveaways' for popular games like Coin Master. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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-fan-page-giveaway-game-hack In PDF document text
    • http://doganov.be/images/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://doganov.be/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://doganov.be/images/coin-master-100-free-spins-link_GM406889139.pdfIn PDF document text
    • http://doganov.be/images/coin-master-village-3_GM406889139.pdfIn PDF document text
    • http://doganov.be/images/coin-master-free-spin-facebook-link_GM406889139.pdfIn PDF document text
    • http://doganov.be/images/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
    • http://doganov.be/images/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://doganov.be/images/coinmasterfreespins_GM406889139.pdfIn PDF document text
    • http://doganov.be/images/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://doganov.be/images/coin-master-hack-tool-no-human-verification_GM406889139.pdfIn PDF document text
    • http://doganov.be/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://doganov.be/images/free-spin-coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://doganov.be/images/no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://doganov.be/images/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://doganov.be/images/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://doganov.be/images/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • http://doganov.be/images/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://doganov.be/images/free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://doganov.be/images/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://doganov.be/images/coin-master-hack-with-lucky-patcher_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_off00004aff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AFF 24956 bytes
SHA-256: fda165c62022f9816dc61760df4e5f6ea88bda234351a56cd599eeb9f77b2c0c
font_01_sfnt_off00008414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8414 2980 bytes
SHA-256: 7759d00b2b93864c79bc0fca70ffdcdc34d821ecd92b660f9baf4d82407f8209
font_02_sfnt_off00008e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E67 18608 bytes
SHA-256: 854f4b4211f415c7f5aa47802dca21b81c8c3685ea946d21c48c5daf2079a60e

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