Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b55eae3211114c8…

MALICIOUS

PDF

42.0 KB Created: 2021-05-17 03:05:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c137c07796de3bb6f41d1e0a3bd28949 SHA-1: d36f3513d0ea7b46aa261f629faee1021560ae8e SHA-256: 2b55eae3211114c80e9ff989173c596c158c69f0f4ed30a1e8fc9bb7ea93cbbe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that are identified as malicious redirectors, specifically targeting users with lures for free game currency and items. The document body, though partially corrupted, contains text related to 'Free Robux' and references the malicious URL. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/free-robux-promo-codes-game-hack In PDF document text
    • https://sitam.co.in/images/free-roblox-girl-clothes_GM431946152.pdfIn PDF document text
    • https://sitam.co.in/images/free-robux-now_GM431946152.pdfIn PDF document text
    • https://sitam.co.in/images/free-coin_GM406889139.pdfIn PDF document text
    • https://sitam.co.in/images/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://sitam.co.in/images/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • https://sitam.co.in/images/freespins-coin-master_GM406889139.pdfIn PDF document text
    • https://sitam.co.in/images/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • https://sitam.co.in/images/free-robux-rewards_GM431946152.pdfIn PDF document text
    • https://sitam.co.in/images/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • https://sitam.co.in/images/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://sitam.co.in/images/free-robux-glitch_GM431946152.pdfIn PDF document text
    • https://sitam.co.in/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://sitam.co.in/images/minecraft-windows-10-free-trial_GM479516143.pdfIn PDF document text
    • https://sitam.co.in/images/2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://sitam.co.in/images/coin-master-on-facebook_GM406889139.pdfIn PDF document text
    • https://sitam.co.in/images/roblox-games-com-free_GM431946152.pdfIn PDF document text
    • https://sitam.co.in/images/cmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://sitam.co.in/images/claim-roblox_GM431946152.pdfIn PDF document text
    • https://sitam.co.in/images/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • https://sitam.co.in/images/coin-master-apk_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
font_00_sfnt_off0000479a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x479A 25664 bytes
SHA-256: f3b430ec16434e0182c398db45ea99a2c1901107dc43115633c9ea887226de05
font_01_sfnt_off00008172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8172 18604 bytes
SHA-256: 81df952e11a915931eb8909d89f5eda5fa0aae9cee1bf8eea3735c5794fb3fb4

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