Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c81d3acc1b9a09…

MALICIOUS

PDF

33.1 KB Created: 2021-06-29 09:49:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2d2bc70ac78c7b0e01ca8c25679722b9 SHA-1: 29c14ea9538dd24ff7d6a5ef7b419dbe4f113c3b SHA-256: e1c81d3acc1b9a0909f60c2d756a638c80175e8172c507e286895206e1b2dc90
240 Risk Score

Malware Insights

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

This PDF document is designed as a lure, using the promise of free game hacks and in-game currency to trick users into clicking malicious links. The document contains numerous links to external PDFs hosted on both a redirector and an IP address, suggesting a chain of malicious content delivery. The ML classifier strongly indicated maliciousness, and the heuristics confirm the use of redirectors and a link farm to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/free-admin-in-any-roblox-game-game-hack In PDF document text
    • http://111.68.26.74/widyapustaka/repository/how-to-hack-other-roblox-account_GM431946152.pdfPDF link annotation
    • http://111.68.26.74/widyapustaka/repository/robux-html-hacks_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/hack-a-game_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/ant-man-shirt-roblox-free_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/roblox-executor-download-virus-free-download_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/top-best-free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/how-to-change-robux-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/happy-birthday-isabella-roblox-speed-hacks_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/free-injecters-roblox-mac_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/free-downloads-for-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/is-there-an-actual-hack-that-work-for-coin-master_GM406889139.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/free-minecraft-hosting_GM479516143.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/how-to-hack-roblox-client_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_001_off00002adc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2ADC 22272 bytes
SHA-256: 2f5a03f871932db04c52f3d2d515a4e431ca21cd85634a4c7764b9597753c914
font_01_sfnt_off00005bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BCB 19384 bytes
SHA-256: c687e40b4a699996c533be5dfeceecf65f3d62c5df79230f2d1bcf41d70e922a