Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a68f9c7731ac88e…

MALICIOUS

PDF

35.6 KB Created: 2021-07-04 00:35:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f1499187b62de6177c28bc3935f3df18 SHA-1: 2f2f0ad5d95bfddce75cf079d52c1272ff9f1013 SHA-256: 0a68f9c7731ac88e86d7a1b4cc0e6e571bb8c6999fffe94900ef2d10218dc35e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including one to a known malicious redirector infrastructure at http://netcdn.tw/app/479516143/was-minecraft-ever-free-game-hack. The document body and heuristics indicate a lure for free game generators or hacks, designed to trick users into clicking these links. The presence of a visual download button further supports a malicious workflow aimed at redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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/479516143/was-minecraft-ever-free-game-hack In PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/coin-master-free-spins--spins_GM406889139.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/coin-master-free-coins-and-spins-link-today_GM406889139.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/coin-master-free-spins-link-quora_GM406889139.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/coin-master-hack-programmers_GM406889139.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/40-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/free-coin-master-spin-generator_GM406889139.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/coin-master-free-spins-23-march-2021_GM406889139.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/coin-master-hack-dot-xyz_GM406889139.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/roblox-how-to-get-free-clothes_GM431946152.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/coin-master-2021-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/tiktok-free-50-likes_GM835599320.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/coin-master-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/free-robux-no-human-verification-generator_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_off00003564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3564 23008 bytes
SHA-256: 9a9b941d19eb758dbe970511f6aa4110241df3b125fd78c4baa77055d2ce168e
font_01_sfnt_off000068f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68F4 18168 bytes
SHA-256: dd30117a17675e2a95f45316c6563603f059e6e4f2122a5e89a28a065fa7a6d6

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