Malicious PDF — malware analysis report

Static analysis result for SHA-256 164d57e9be50e721…

MALICIOUS

PDF

46.1 KB Created: 2021-06-09 06:00:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 120403284bb5a8560d2b9c9bca50c50d SHA-1: af3b33e171a29fe5a4480a985325dc5d8f6d573e SHA-256: 164d57e9be50e721fb195c386ac6697f494e2a649733ffc516cfc27bd15e5a22
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains a malformed stream and links to known malicious redirector infrastructure. The primary lure is a "free generator / game hack" which leads to a URL hosted on netcdn.tw, a known malicious domain. The document likely exploits a PDF vulnerability to execute code or redirect the user to a malicious site, aiming to trick them into downloading further malware or engaging in scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

Heuristics 5

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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-roblox-codes-that-works-game-hack In PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/moon-active_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/minecraft-pocket-edition-free-ios_GM479516143.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/minecraft-ps4-free_GM479516143.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/how-do-i-earn-robux_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/hacks-roblox_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/freegames911com-coinmastertipsandcheats2021freecoinsandspins_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/coin-master-free-daily-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/free-minecraft-printables-food-labels_GM479516143.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/coin-master-card-hack_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/roblox-script-hack_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
stream_004_off00005465.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5465 25576 bytes
SHA-256: 319b1494c225b4d4089accbbe81a361a84fc6993f75a0a03b10b7f38a97cfc1d
font_01_sfnt_off00008f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F5C 18988 bytes
SHA-256: 9ec962eaf320eb06a9c8d2298ee3afe8bdb7b951a1e291fb333b0cee8783faf1

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