Malicious PDF — malware analysis report

Static analysis result for SHA-256 840fd5a73a37be5c…

MALICIOUS

PDF

41.9 KB Created: 2021-05-20 04:01:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: cf9f5bee31a2a4f26d0fb0918f057f45 SHA-1: e2cf51a671e6ff05ffe80b5e940404db46bce301 SHA-256: 840fd5a73a37be5c6082b2f4c1a4b91e2407cbb3ecf2fa9a13c42e504a67bf5d
260 Risk Score

Malware Insights

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

The PDF document contains numerous links to websites offering game hacks and generators, including a primary link to 'roblox-free-rubox-game-hack'. The presence of a fake CAPTCHA heuristic suggests an attempt to trick users into performing an action, likely to download a payload or execute code. The document body and embedded URLs strongly indicate a phishing or scam attempt leveraging popular game themes to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/roblox-free-rubox-game-hack In PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-hack-download-ios_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-vip-hack_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-online-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/hack-xp-net-generators-coin-master_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-can-i-get-free-coinsn-coin-master_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-hack-app-android-download_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-sued_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/hack-my-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-mods-for-coin-master_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/pubg-uc-2021_GM1330123889.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coinmaster-gps-user-review-coinmaster-coin-master-hack-pagedemo-index_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/daily-free-spins_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-phantom-forces-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
font_00_sfnt_off0000484a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x484A 24888 bytes
SHA-256: 0b2ba10f205af47d2c5bbd97f6db4aef979a4d3e078ce428e4c90c9fb6d727b2
font_01_sfnt_off000081de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81DE 18088 bytes
SHA-256: 03c92d59c548fbfdae08874221752d30f8caaed88781636bf7d18542e7c5fe52

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