Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a60caae8dde383b…

MALICIOUS

PDF

41.8 KB Created: 2021-05-13 01:09:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d851f2a1d538a246e2a99274fe265d4e SHA-1: d7c67260931482236a7cdf599a331ca24c8b971c SHA-256: 2a60caae8dde383b8b0ef671db226924b923e2e7eb26918c6a54339ddf051d47
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically advertising 'free Robux' and 'game hacks' to lure victims. The primary redirector URL is https://netcdn.xyz/app/431946152/rbx-land-free-robux-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/431946152/rbx-land-free-robux-game-hack In PDF document text
    • http://tah-li.com/images/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://tah-li.com/images/inappropriate-roblox-games_GM431946152.pdfIn PDF document text
    • http://tah-li.com/images/robux-com-free_GM431946152.pdfIn PDF document text
    • http://tah-li.com/images/code-free-robux_GM431946152.pdfIn PDF document text
    • http://tah-li.com/images/coin-master-free-spins-2021-today_GM406889139.pdfIn PDF document text
    • http://tah-li.com/images/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • http://tah-li.com/images/coin-master-pet-food-free_GM406889139.pdfIn PDF document text
    • http://tah-li.com/images/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • http://tah-li.com/images/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://tah-li.com/images/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://tah-li.com/images/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://tah-li.com/images/get-free-lives-on-coin-master_GM406889139.pdfIn PDF document text
    • http://tah-li.com/images/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://tah-li.com/images/coin-master-today_GM406889139.pdfIn PDF document text
    • http://tah-li.com/images/how-to-earn-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://tah-li.com/images/coin-master-hack-dot-xyz_GM406889139.pdfIn PDF document text
    • http://tah-li.com/images/coin-master-hack-ios-reddit_GM406889139.pdfIn PDF document text
    • http://tah-li.com/images/free-spins-coin-master-october-13-2021_GM406889139.pdfIn PDF document text
    • http://tah-li.com/images/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://tah-li.com/images/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://rblx.landIn 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_off0000467f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x467F 25196 bytes
SHA-256: 5ba61d37fc6594932557d0d82cde9191c5c7676950b8479c8c2de5b8473fb6fe
font_01_sfnt_off00008063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8063 18416 bytes
SHA-256: ed1846d837a30ccb27e25bdb955d82aabb746909bdcfb120b1e9cc4e6290fa01

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