Malicious PDF — malware analysis report

Static analysis result for SHA-256 28090cc71ef2c7e0…

MALICIOUS

PDF

47.0 KB Created: 2021-06-07 05:42:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: bc49fbafa3244e9466656f14c9b37b6d SHA-1: 30eb8c4c326852373e7b0c9e6e67cec1720aef52 SHA-256: 28090cc71ef2c7e05f44410142fc5102438aa74f8da38132d70d6a43227e1a8a
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to malicious redirectors and IP addresses, disguised as offers for free game currency or hacks. The document body explicitly mentions 'Free Robux With No Downloads' and includes a URL pointing to a known malicious redirector. The presence of these links suggests the document is designed to lead users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.
  • 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 https://netcdn.tw/app/431946152/free-robux-with-no-downloads-game-hack In PDF document text
    • http://183.91.70.11/repository/pubg-uc-qiymetleri_GM1330123889.pdfPDF link annotation
    • http://183.91.70.11/repository/collect-free-spin-linms-coin-master_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/is-minecraft-free-on-mac_GM479516143.pdfIn PDF document text
    • http://183.91.70.11/repository/free-realistic-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://183.91.70.11/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/real-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/robux-place-rewards_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/how-many-levels-in-coin-master_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/cool-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/earn-robux-today-earn-robux-today_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_off00005012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5012 29704 bytes
SHA-256: 26329fb442a62d5b33031c3b0fc2af6638449d7e1335f7360e4e26e928c118b3
font_01_sfnt_off000091b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91B6 19412 bytes
SHA-256: 27e1e372f473ff78657456357d5648d904a0ba66ddbfd7877b079d93d83a39e2

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