Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5876aac6052ff5f…

MALICIOUS

PDF

36.0 KB Created: 2021-07-05 18:52:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: fd0536ca62034a6b16651f4ac525023d SHA-1: 546be4b3e73f564e389b77db17f1fb6669080175 SHA-256: f5876aac6052ff5ffaa2f4463f4c2a7dfb39fad3964dc7921d22f1eb952d9776
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users to external sites, masquerading as generators for game currency or hacks. The primary redirector URL is http://netcdn.tw/app/406889139/free-coins-coin-master-link-game-hack, which likely leads to further malicious content or exploits. The extensive use of SEO-optimized PDF links suggests a campaign to distribute malware or phishing content through search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.tw/app/406889139/free-coins-coin-master-link-game-hack In PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/how-to-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/roblox-hacked-client-windows-10_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/exclusive-roblox-avatars-available-for-free-you-can-change-your_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/how-to-hack-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/free-roblox-items-com_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/how-to-use-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/app-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/gaming-cheats-robux_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/robux-no-survey_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/roblox-jailbreak-play-for-free-online_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/unlimited-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/how-to-hack-in-somebodys-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/free-roblox-generator_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/roblox-tower-of-hell-hack-script_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/free-spins-on-coin-masters_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/free-exploits-for-roblox_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_off000036d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36D3 22984 bytes
SHA-256: f219e857cd17faf906e5be90e06c3b4f146de29cddaa48077b3bbaed6688ca1b
font_01_sfnt_off00006a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A78 18168 bytes
SHA-256: b0fd03f2280421e1c8ba538a35ec3a9afcfe64ddb22ef6ef66156561f264a38b

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