Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac899feec676bbc3…

MALICIOUS

PDF

45.5 KB Created: 2021-05-16 03:33:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3da73566524ae1c1e70ebb1cdbe49fab SHA-1: fd575c30deca646f533fcb349bc9cd76510ee88e SHA-256: ac899feec676bbc32f32bc455540117f4ed80717c99cd499ff12e30d89e52f0f
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains multiple links to malicious redirectors, disguised as "game hacks" and impersonating Microsoft to lure users. The primary link directs to infrastructure known for hosting malicious content. While no scripts were directly extracted, the presence of PDF-specific malicious link heuristics and the overall lure suggest an attempt to exploit users into visiting malicious sites, likely to download further malware or engage in credential phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/479516143/how-to-get-minecraft-bedrock-edition-on-pc-for-free-game-hack.
  • 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 https://netcdn.xyz/app/479516143/how-to-get-minecraft-bedrock-edition-on-pc-for-free-game-hack In PDF document text
    • http://mbbs.hr/files/javascript-free-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/best-hacked-client_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/fbchampion_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-unlimited-coins-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/hack-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/smart-lodhi-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/hack-coin-pro-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/is-minecraft-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-hack-apk-download-latest-version_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/roblox-arsenal-hacks-download_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a39.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A39 25632 bytes
SHA-256: 03c0a7e00c60647933985803330c0c003fc79a89965cc398605506d3e26e7e7f
font_01_sfnt_off000084c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84C5 2860 bytes
SHA-256: 89ec581cebd0e90262805b5db309de4686eceb75a25d429085148d13353d0453
font_02_sfnt_off00008e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E9E 18588 bytes
SHA-256: 22ac8c3ecfb52a55793ff71594f7fcfb36c91cb725e140eddc746c1d049752ce

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