Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfa308a2a59cce2…

MALICIOUS

PDF

33.6 KB Created: 2021-06-19 00:07:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e2b2a789487cf360021fd65ccf8b503b SHA-1: d13e2c3253dfec71d197533ed1b580ab137ec89c SHA-256: acfa308a2a59cce2249e9ff7df4d0c45541013433e0a85b102b6933fdb1c560b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free in-game items for popular games to trick users into clicking malicious links. The primary link, http://netcdn.co/app/431946152/free-avatar-in-roblox-2021-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/free-avatar-in-roblox-2021-game-hack In PDF document text
    • http://library.ulb.ac.id/repository/how-to-hack-dragon-ball-after-future-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coinmaster-spin-ml-link_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-promotion-codes_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/best-free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-minecraft-capes-no-mods_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/cone-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/good-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/testing-5-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-roblox-promo-codes-april-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-coins-twitter_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/pokemon-go-free-and-home-transfer_GM1094591345.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-many-levels-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/clean-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/pastebin-com-roblox-free-robux_GM431946152.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_off00002e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E43 21452 bytes
SHA-256: c8fc2fe1b45e1cfe8ff45e8b6801b63874fd9185b35d9e1d52ff02bcc3b65d5a
font_01_sfnt_off00005d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D4C 19268 bytes
SHA-256: 7002f100df355b88413c532b1f066f840ea93116474cc7df4147da4a86c085f4

Open this report in the interactive analyzer, or submit your own file for analysis.