Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed87cb828bb4da5…

MALICIOUS

PDF

49.0 KB Created: 2021-06-08 18:09:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4ea91221556fa61a2c11052df4a4c043 SHA-1: e8770a3087ec285c3e7b5671ae7ed1be6485b313 SHA-256: 6ed87cb828bb4da5b44203a3e8d3ce338fc86b322986308dd87feb7e79fdcff1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a malicious redirector lure, specifically referencing 'free generator / game hack' content. The embedded URL, https://netcdn.tw/app/431946152/free-robux-generator-2021-no-human-verification-rearl-game-hack, is directly linked to malicious redirector infrastructure. The document body, though partially corrupted, contains similar text and the same URL, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/free-robux-generator-2021-no-human-verification-rearl-game-hack In PDF document text
    • http://babbibooth.com/images/roblox-mad-city-cheats_GM431946152.pdfIn PDF document text
    • http://babbibooth.com/images/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdfIn PDF document text
    • http://babbibooth.com/images/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://babbibooth.com/images/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://babbibooth.com/images/minecraft-free-computer-game_GM479516143.pdfIn PDF document text
    • http://babbibooth.com/images/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://babbibooth.com/images/coin-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://babbibooth.com/images/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://babbibooth.com/images/master-coin-free-link_GM406889139.pdfIn PDF document text
    • http://babbibooth.com/images/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://babbibooth.com/images/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://babbibooth.com/images/pokemon-go-free-2021_GM1094591345.pdfIn PDF document text
    • http://babbibooth.com/images/free-robux-stream_GM431946152.pdfIn PDF document text
    • http://babbibooth.com/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://babbibooth.com/images/coin-master-pet-food-hack_GM406889139.pdfIn PDF document text
    • http://babbibooth.com/images/rbx-robux_GM431946152.pdfIn PDF document text
    • http://babbibooth.com/images/get-free-robux_GM431946152.pdfIn PDF document text
    • http://babbibooth.com/images/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://babbibooth.com/images/free-fire-vs-pubg-tik-tok_GM835599320.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_004_off00004f49.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F49 28404 bytes
SHA-256: 5fa7ab447333f362f43d3790539e8d50e953fdcf08f4babff381d5f3db86e994
font_01_sfnt_off0000900a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x900A 2828 bytes
SHA-256: db1860fd79a3f2cbe32e2bada3ba4c68a2d581b7a24294387cd777233cc9cef6
font_02_sfnt_off000099c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99C0 19336 bytes
SHA-256: 9ff35a53bcf30bf95a0f3cc7f561b2974a5746dd93779b5e496a2f1ce3b16467