Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd013dc811a2b63…

MALICIOUS

PDF

44.3 KB Created: 2021-06-10 21:25:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 10562c48d9408e21ec543fc3ebd2aa53 SHA-1: a751e2811717a34c28efc401afe28e0b27c21b2f SHA-256: 6fd013dc811a2b6379fb85d663bf724884ee1e5ef345c9787bcec74512dd544f
140 Risk Score

Malware Insights

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

The PDF document contains a malicious redirector link impersonating Microsoft to lure users with a 'Free Robux Hack' offer. The ML classifier strongly indicated maliciousness, and the presence of a visual download button further supports a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely for credential harvesting or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • 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.tw/app/431946152/free-robux-hack.net-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.tw/app/431946152/free-robux-hack.net-game-hack In PDF document text
    • http://schrichte.de/images/cool-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://schrichte.de/images/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • http://schrichte.de/images/free-robux-videos_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://schrichte.de/images/minecraft-hacks-xbox-one_GM479516143.pdfIn PDF document text
    • http://schrichte.de/images/free-roblox-injecter-v3rmillipn_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/pubg-uc-free-redeem-code_GM1330123889.pdfIn PDF document text
    • http://schrichte.de/images/minecraft-gun-games-free_GM479516143.pdfIn PDF document text
    • http://schrichte.de/images/how-to-hack-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://schrichte.de/images/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/free-roblox-invitations-loadstrings-full-lua-free_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/coin-master-hack-tuts_GM406889139.pdfIn PDF document text
    • http://schrichte.de/images/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://schrichte.de/images/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://schrichte.de/images/free-robux-games_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://schrichte.de/images/robux-hack-2021-no-survey-verification_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
stream_004_off00004eb0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EB0 25824 bytes
SHA-256: 21e94d15141189a66c53018e9c74198c684d9908b95c0486e4f6e7f57249bf5a
font_01_sfnt_off000089bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89BF 18580 bytes
SHA-256: 81218bc460e0ceb075b3f39e9eaa8084913025a0b07c71ac9a05ecfd204cdfec

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