Malicious PDF — malware analysis report

Static analysis result for SHA-256 2755cfbd06f706bb…

MALICIOUS

PDF

33.0 KB Created: 2021-06-28 07:50:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4c5e115c4806bc6de73e0b9cbca7fb33 SHA-1: 7d1d708ba523de09cbc32ff8ce083cbd20c4d79c SHA-256: 2755cfbd06f706bba529db85c27cc991bb16a66280a3d2ca4f62a64c4f326c28
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external sites, including a known malicious redirector and an IP address hosting a link farm of other PDFs. The document body text and embedded URLs explicitly promise free game items and hacks, indicating a lure to trick users into visiting these malicious sites. No scripts were extracted, but the overall structure and content strongly suggest a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.co/app/431946152/free-roblox-codes-2021-game-hack In PDF document text
    • http://110.164.163.187/ckfinder/userfiles/files/coin-master-free-coins-and-spins-link_GM406889139.pdfPDF link annotation
    • http://110.164.163.187/ckfinder/userfiles/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://110.164.163.187/ckfinder/userfiles/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://110.164.163.187/ckfinder/userfiles/files/add-robux_GM431946152.pdfIn PDF document text
    • http://110.164.163.187/ckfinder/userfiles/files/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://110.164.163.187/ckfinder/userfiles/files/best-free-avatars-on-roblox_GM431946152.pdfIn PDF document text
    • http://110.164.163.187/ckfinder/userfiles/files/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://110.164.163.187/ckfinder/userfiles/files/free-tiktok-accounts-with-followers_GM835599320.pdfIn PDF document text
    • http://110.164.163.187/ckfinder/userfiles/files/haktuts-2021-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://110.164.163.187/ckfinder/userfiles/files/roblox-speed-and-jump-hack-2021_GM431946152.pdfIn PDF document text
    • http://110.164.163.187/ckfinder/userfiles/files/coin-master-free-link-facebook_GM406889139.pdfIn PDF document text
    • http://110.164.163.187/ckfinder/userfiles/files/roblox-svg-free_GM431946152.pdfIn PDF document text
    • http://110.164.163.187/ckfinder/userfiles/files/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • http://110.164.163.187/ckfinder/userfiles/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://110.164.163.187/ckfinder/userfiles/files/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://110.164.163.187/ckfinder/userfiles/files/robux-games_GM431946152.pdfIn PDF document text
    • http://110.164.163.187/ckfinder/userfiles/files/get-gold-coin-master-village-hack_GM406889139.pdfIn PDF document text
    • http://110.164.163.187/ckfinder/userfiles/files/free-spins-promo-code-for-coin-master_GM406889139.pdfIn PDF document text
    • http://110.164.163.187/ckfinder/userfiles/files/coin-master-free-spin-facebook-link_GM406889139.pdfIn PDF document text
    • http://110.164.163.187/ckfinder/userfiles/files/roblox-hacked-com-2021_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_off000029c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29C9 22340 bytes
SHA-256: 558ff6c308b571b81316eb4bd5e49aaad4fe87532e9ab8e3e225a330955e3ead
font_01_sfnt_off00005b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B6A 19228 bytes
SHA-256: ed0cdc110a2a956eeb6aac9ce416b1528a5bed00449fa61b89a4125e4ac6fa5f

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