Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cfb3d06b6a400d9…

MALICIOUS

PDF

34.8 KB Created: 2021-07-07 23:42:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ce5071ceb819cd54f4bbc52d0785ba5e SHA-1: 3aeb985f801342513c93f1f1dbc38001a27f2aea SHA-256: 7cfb3d06b6a400d90e4a18708d11813379d4d20e1a9dfed4be37ac9cf4e2d0ad
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game currency and hacks to trick users into clicking malicious links. The primary link directs to a known malicious redirector infrastructure, which in turn serves further malicious PDF files. The document's content and embedded URLs strongly indicate a phishing or scamming attempt, likely designed to lead users to credential harvesting sites or download further malware.

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/431946152/roblox36com-free-robux-game-hack In PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/who-tiktok-free-followers_GM835599320.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/tiktok-free-money_GM835599320.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/hack-for-killin-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/can-people-hack-you-through-roblox-account_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/roblox-redeem_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/spin-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/static-moonactive_GM406889139.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/get-free-roblox-generator_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/coin-master-cheat-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/minecraft-hacks-115-2_GM479516143.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/free-robux-scam_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/irobux-robux-cheat_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/what-to-do-if-your-roblox-acc-has-been-hacked_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/free-coins-coin-master-2021_GM406889139.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_off0000300a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x300A 22416 bytes
SHA-256: f283390672f7ecae025ee2aed45ec51441ad36b60586fcbedce595fdb5473b9d
font_01_sfnt_off00006216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6216 19392 bytes
SHA-256: f5d8fb1e1227d04f94fc2588cf3bb8579c3297dc080a6331d916c9c738f57d9e

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