Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb08c297b32c48e…

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 00:27:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 91db21404fe9fd6eabf48460af479d15 SHA-1: 6d63c64ba3ae0cafef3494b2557837d6d5e94397 SHA-256: dfb08c297b32c48e1dc3d0a6860ec0baace4b10c39a15a29625a90b5ad966826
160 Risk Score

Malware Insights

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

The PDF contains a lure for game hacks and redirects to a known malicious URL. The ML classifier also flagged this PDF with high confidence. While no scripts were extracted, the embedded URL is the primary indicator of malicious intent, likely leading to a phishing or malware download site.

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/coin-master-cards-for-free-game-hack In PDF document text
    • https://www.ak-oroslavje.hr/files/roblox-hack-site-2021_GM431946152.pdfIn PDF document text
    • https://www.ak-oroslavje.hr/files/free-robux-not-a-scam-ehclips_GM431946152.pdfIn PDF document text
    • https://www.ak-oroslavje.hr/files/rbx-land-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ak-oroslavje.hr/files/100-free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.ak-oroslavje.hr/files/hack-coin-master-8-ball-pool_GM406889139.pdfIn PDF document text
    • https://www.ak-oroslavje.hr/files/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • https://www.ak-oroslavje.hr/files/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://www.ak-oroslavje.hr/files/coin-master-free-spin-link-twitter_GM406889139.pdfIn PDF document text
    • https://www.ak-oroslavje.hr/files/get-free-tiktok-followers-no-verification_GM835599320.pdfIn PDF document text
    • https://www.ak-oroslavje.hr/files/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • https://www.ak-oroslavje.hr/files/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • https://www.ak-oroslavje.hr/files/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • https://www.ak-oroslavje.hr/files/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • https://www.ak-oroslavje.hr/files/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://www.ak-oroslavje.hr/files/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ak-oroslavje.hr/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://www.ak-oroslavje.hr/files/roblox-hacks-game_GM431946152.pdfIn PDF document text
    • https://www.ak-oroslavje.hr/files/free-roblox-glasses_GM431946152.pdfIn PDF document text
    • https://www.ak-oroslavje.hr/files/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdfIn PDF document text
    • https://www.ak-oroslavje.hr/files/coin-master-online-hack-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
stream_002_off00003151.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3151 23232 bytes
SHA-256: 2a3cd227224f14ef42cf04ad423411afbf66cb93932f74766c2484f33fce04ff
font_01_sfnt_off000065d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65D0 18172 bytes
SHA-256: 51a6fa1d0322029b9e2ca075150f5a08b3c54d54cadd2367ada3da490e26397a

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