Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd40b6b524e9c177…

MALICIOUS

PDF

46.5 KB Created: 2021-06-03 13:16:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5102394b40981e97996767f8a53b282e SHA-1: 4e88f4aafdb6ba89d7793a8a0814c7e92f863808 SHA-256: fd40b6b524e9c177b698ff074ba9dd0cb7dc59a1b7f9c0e2b5653c12149ca263
260 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into clicking malicious links, disguised as "free generator / game hack" content. The document contains numerous links, including one pointing to known malicious redirector infrastructure. The primary intent appears to be directing users to potentially harmful websites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.online/app/431946152/roebucks-on-roblox-game-hack In PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/free-coin-master-spins-no-verification_GM406889139.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/optifine-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/hack-minecraft_GM479516143.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/roblox-avatar-editor-free_GM431946152.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/instagram-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/roblox-generator-com_GM431946152.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/minecraft-hacks-xbox-one_GM479516143.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/free-roblox-girl-hair-not-a-model_GM431946152.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_off0000505d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x505D 23896 bytes
SHA-256: a402629010ea897052b08f4afa6024ef1c2b5973a75b2799fe353b2b7b13686f
font_01_sfnt_off0000869a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x869A 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00009342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9342 18096 bytes
SHA-256: 660f2ad6d064874c4042e66c51e1deb22834a2626620b3d43ba9bd9331fe9e6c

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