Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b18b57ebe6689a1…

MALICIOUS

PDF

34.6 KB Created: 2021-07-03 13:27:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 6747adc3306902f5823a11e621a5e062 SHA-1: 086227888baf056fefd8caf637efca8e4e7303e1 SHA-256: 5b18b57ebe6689a1f7dffda3de4ae36998ead91a063121260a6bb429725f158f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free generator' or 'game hack' lures for popular games. The document body and embedded URLs reinforce this theme, aiming to trick users into visiting malicious sites. The ML classifier also strongly indicated maliciousness.

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.tw/app/406889139/blogspot-free-spins-coin-master-game-hack In PDF document text
    • http://oca.undil.tl/repository/appsmobinfo-coinmasterhack-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/radio-cheat-roblox_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-hacks-pc-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-menu_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-hacked-client-bedrock_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/best-free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-watch-ads-for-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-spin-and-win-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/avatar-hacker-en-roblox_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-september-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/cheat-engine-roblox-code_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-free-robuxhack_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/robloxheroxyz-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_off000031bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31BC 22584 bytes
SHA-256: 4a45a3707bdc047c93913e9e2f30882bec68cbc4772530faa9d1e638633825bc
font_01_sfnt_off0000642a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x642A 18464 bytes
SHA-256: 230ca97f16dd2ddf1879142f15263642e6919db147f0bcf840325c8143f28d8e