Malicious PDF — malware analysis report

Static analysis result for SHA-256 58db486430188113…

MALICIOUS

PDF

34.6 KB Created: 2021-07-04 18:00:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9294b80aa3dbedd5491f3ca316698501 SHA-1: b795b6b8460172366add65d8418abcf3a3495985 SHA-256: 58db48643018811319884fc00174f87864966e02c56f785778ee4e260395675e
240 Risk Score

Malware Insights

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

This PDF document employs a common lure of 'free Robux' and game hacks to trick users into clicking malicious links. The document contains a mass of external PDF links, many pointing to an IP address, and also links to a known malicious redirector. These links likely lead to further phishing pages or exploit kits, aiming to compromise the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.tw/app/431946152/free-robux-roblox-promo-codes-game-hack In PDF document text
    • http://103.40.122.33/akasia/repository/roblox-shinobi-life-free-spins-2021_GM431946152.pdfPDF link annotation
    • http://103.40.122.33/akasia/repository/descargar-hack-de-roblox-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/escape-room-cheats-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/script-hack-2021-roblox-bubble-gum-simulator-free-passes_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/robux-free-no-pay-no-verification_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/backpacking-hack-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-and-tix-generator-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/get-robux-for-free-for-robloxcom-free4mobile24com_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/minecraft-114-4-download-free_GM479516143.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-how-to-make-a-free-t-shirt_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/comment-hacker-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-lumber-tycoon-2-hack-deutshc_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-2021-android_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-games-that-you-can-play-online-for-free_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-download-minecraft-for-free-ios_GM479516143.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_off00003003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3003 22136 bytes
SHA-256: 826f111c813c6bc30d965a297ad5e34df6ac12503626cdda5a8ac0dc28092ee2
font_01_sfnt_off00006125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6125 19380 bytes
SHA-256: a452d0c191873ed4d1cd88fa82656ca938fba3e74f496bef56901f9d10460b65

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