Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a254434ffc2d86…

MALICIOUS

PDF

43.8 KB Created: 2021-05-11 15:31:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3001c5cd9c95139fc45dee6f1f97da05 SHA-1: a98e6a1481803a7d36a0f7f5f4caa0e91d8af969 SHA-256: d4a254434ffc2d868e76fe295bb6d2347ea3f7922386fd63044966f9d1d2ac39
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links and a lure for game hacks, specifically mentioning 'free Robux'. The document body, though partially corrupted, contains a URL that aligns with the lure. The presence of numerous embedded links suggests an attempt to drive traffic to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/431946152/how-to-get-free-robux-fast-and-easy-game-hack In PDF document text
    • https://urp.itk.ac.id/asset/backend/upload/ckeditor/files/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://urp.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://urp.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-free-spins-glitch_GM406889139.pdfIn PDF document text
    • https://urp.itk.ac.id/asset/backend/upload/ckeditor/files/free-roblox-executor-no-key_GM431946152.pdfIn PDF document text
    • https://urp.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://urp.itk.ac.id/asset/backend/upload/ckeditor/files/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • https://urp.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-rewards_GM431946152.pdfIn PDF document text
    • https://urp.itk.ac.id/asset/backend/upload/ckeditor/files/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://urp.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://urp.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-heroes-online_GM431946152.pdfIn PDF document text
    • https://urp.itk.ac.id/asset/backend/upload/ckeditor/files/50-free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://urp.itk.ac.id/asset/backend/upload/ckeditor/files/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://urp.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-hack-ios-no-human-verification_GM406889139.pdfIn PDF document text
    • https://urp.itk.ac.id/asset/backend/upload/ckeditor/files/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://urp.itk.ac.id/asset/backend/upload/ckeditor/files/free-coins-for-flip-master_GM406889139.pdfIn PDF document text
    • https://urp.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-hack-without-verification-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • https://urp.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-sexually-abused_GM431946152.pdfIn PDF document text
    • https://urp.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://urp.itk.ac.id/asset/backend/upload/ckeditor/files/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://urp.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-hack-coin-master-without-root_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
font_00_sfnt_off00004b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B73 25868 bytes
SHA-256: 9deea089406b9f28de6ab66e1e3f93285e31a1c3b891f8270aa137b64fa5ae4a
font_01_sfnt_off0000871d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x871D 18864 bytes
SHA-256: 264ac3d9ee16189788a918c90b00fec891485e046f110455159a23ab28eb8c09

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