Malicious PDF — malware analysis report

Static analysis result for SHA-256 88dee84baff17d55…

MALICIOUS

PDF

45.7 KB Created: 2021-05-13 07:48:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: fdfa23e4b22c7d9f0103a593025432c9 SHA-1: 0eda6f33aa777b6c7ebb484369c2c1cbb44df7ba SHA-256: 88dee84baff17d556dadabfd93e72b1b89a2702285d13004c036cb285fa33b06
160 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, identified as malicious redirectors and game hack lures. The ML classifier also flagged the document as malicious. The presence of embedded URLs and the nature of the lures suggest an attempt to direct the user to a site that likely hosts further malicious content or exploits. No scripts were extracted, but the document structure and heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/daily-free-spins-coin-master-heaven-game-hack In PDF document text
    • http://ptts.pl/images/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/free-redeem-code-for-coin-master_GM406889139.pdfIn PDF document text
    • http://ptts.pl/images/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/get-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://ptts.pl/images/hack-a-game_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/free-minecraft-com_GM479516143.pdfIn PDF document text
    • http://ptts.pl/images/best-free-hacked-client_GM479516143.pdfIn PDF document text
    • http://ptts.pl/images/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://ptts.pl/images/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://ptts.pl/images/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/minecraft-116-1-download_GM479516143.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004e78.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E78 24268 bytes
SHA-256: 860890b916d21492274200d030c8d720764b4d37cc015247a3ab92d24c9ff457
font_01_sfnt_off0000862c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x862C 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FDD 18420 bytes
SHA-256: 83c7106d652078d6845a2ce66abf209357cb05486614c7f7fe473a519aef161c

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