Malicious PDF — malware analysis report

Static analysis result for SHA-256 457dcef2089882e2…

MALICIOUS

PDF

44.8 KB Created: 2021-06-09 17:03:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d89f5bcc54ec51e86eb6adbcbeb210c4 SHA-1: 0e9c989114bee3e800d74664b9d024a1a251cd79 SHA-256: 457dcef2089882e251ce6da2567c3a5a532df06b464f104dc44282806e8edd5a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are flagged as malicious redirectors or part of a link farm. The document body and heuristics indicate a lure for game hacks and free currency, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the links and the PDF structure strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/roblox-novlcip-hacks-game-hack In PDF document text
    • http://www.ocic.hr/files/coin-master-rare-cards-hack_GM406889139.pdfIn PDF document text
    • https://www.ocic.hr/files/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/earn-robux-now_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/minecraft-client_GM479516143.pdfIn PDF document text
    • http://www.ocic.hr/files/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://www.ocic.hr/files/play-for-free-robux-roblox_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ocic.hr/files/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • https://www.ocic.hr/files/roblox-dead-winter-infinity-hack_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/aristois-minecraft-hack_GM479516143.pdfIn PDF document text
    • https://www.ocic.hr/files/new-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.ocic.hr/files/roblox-noob-vs-hacker-vs-pro_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://www.ocic.hr/files/free-minecraft-for-kids_GM479516143.pdfIn PDF document text
    • https://www.ocic.hr/files/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/minecraft-story-mode-free-download_GM479516143.pdfIn PDF document text
    • http://www.ocic.hr/files/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/where-to-get-free-robux_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_off00004fb4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FB4 25732 bytes
SHA-256: 8235304d94f99c7457ac6c82efd1813d3ee4182e89f3f94356c3c5a030c5393e
font_01_sfnt_off00008ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA2 18592 bytes
SHA-256: 8a4b07ff3f37f72016da159bd87c224bd36e4c3c486a620e113543a2feea1c23

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