Malicious PDF — malware analysis report

Static analysis result for SHA-256 857a4984d51ab3c8…

MALICIOUS

PDF

43.7 KB Created: 2021-06-13 23:00:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a855ca802e39f2b8a2f48cfde20ee05a SHA-1: c918b75350d7851c3e48f8d1d0cfb91e1cf0fe59 SHA-256: 857a4984d51ab3c8707133831615f410f666ba423394f72237a35d435af19c61
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users to external websites, masquerading as generators or hacks for popular games. The primary link directs to a known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://netcdn.co/app/431946152/new-cheat-in-roblox-jailbreak-game-hack In PDF document text
    • http://www.gox.pt/images/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://www.gox.pt/images/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdfIn PDF document text
    • http://www.gox.pt/images/free-pdf-of-roblox-characters_GM431946152.pdfIn PDF document text
    • http://www.gox.pt/images/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://www.gox.pt/images/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://www.gox.pt/images/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://www.gox.pt/images/how-to-get-free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.gox.pt/images/roblox-catalog-free_GM431946152.pdfIn PDF document text
    • http://www.gox.pt/images/free-roblox-toy-codes_GM431946152.pdfIn PDF document text
    • http://www.gox.pt/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.gox.pt/images/play-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://www.gox.pt/images/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.gox.pt/images/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://www.gox.pt/images/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://www.gox.pt/images/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • http://www.gox.pt/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.gox.pt/images/oprewards-com-robux_GM431946152.pdfIn PDF document text
    • http://www.gox.pt/images/free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://www.gox.pt/images/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.gox.pt/images/get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000482d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x482D 27464 bytes
SHA-256: 30db287335a109947cfdc3da72489aa83a17b508b3a83f6d4fee87f265430ef9
font_01_sfnt_off000086a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86A8 18900 bytes
SHA-256: 06ed33bb736c87f5ae57690af87e84374890a7f7cf69cdc671f9d00c138e7763

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