Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5810ea055f70216…

MALICIOUS

PDF

35.1 KB Created: 2021-07-05 18:22:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b7bac68ef1c7e79c36a19da5858ed7a2 SHA-1: 3b6eb8fd9412e3010cce1fdba8c44e96ba642b43 SHA-256: c5810ea055f7021600bd49584ada7c20244ced39948331a93bfe450e1cdf4534
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document employs a lure of free game currency and hacks to trick users into clicking malicious links. It contains numerous links to a redirector and IP addresses hosting further PDF files, likely as part of a link farm or SEO poisoning campaign. The ML classifier strongly indicated maliciousness, and the presence of multiple malicious redirector links confirms a high-risk lure.

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/how-to-get-roblox-premium-for-free-2021-game-hack In PDF document text
    • http://202.56.165.220/digilab/repository/how-to-do-knife-hack-on-roblox_GM431946152.pdfPDF link annotation
    • http://202.56.165.220/digilab/repository/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/roblox-rocitizens-cheats-2021_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/how-can-you-get-robux_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/best-roblox-hack-client_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/robux-hack-infinite-robux_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/free-robux-without-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/roblox-how-to-get-free-robux-2021-no-hack_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/hack-any-tycoon-roblox_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/roblox-join-game-hack_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/is-the-game-roblox-free_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/roblox-cheat-engine-for-mac_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/pastebin-free-roblox-usernames_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/free-vip-roblox_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/roblox-prison-life-cheat-engine-hack_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/roblox-what-to-do-when-you-get-hacked_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
font_00_sfnt_off00002ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FFE 22276 bytes
SHA-256: d64c073d84dc08b1bf26ec1033d12e318e1ea4a059112ce7c10b7192e6b9cb83
font_01_sfnt_off00006169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6169 19992 bytes
SHA-256: 5d92c0ac708cb6372069878ce274a0583dd4db4fed5f7a9ab4827dfd753440d4

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