Malicious PDF — malware analysis report

Static analysis result for SHA-256 df78775166d6b9c2…

MALICIOUS

PDF

33.8 KB Created: 2021-06-28 19:27:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 38f5bc9257a9d64bbb0aa2b34c926a6a SHA-1: b24e4be914a2528c340d47c136c651f9afefedfb SHA-256: df78775166d6b9c24ef952642c96f8dc5e6dd74b9c669043fadf3684b0e349c8
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-boy-shirts-roblox-game-hack PDF link annotation
    • http://183.91.70.11/repository/roblox-scythe-script-hack_GM431946152.pdfPDF link annotation
    • http://183.91.70.11/repository/free-robux-hack-on-phone-no-human-verification_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/how-to-get-war-machine-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/pop-slots-free-vegas-casino-slots-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/easy-no-survey-free-robux_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/minecraft-online-free-no-download_GM479516143.pdfIn PDF document text
    • http://183.91.70.11/repository/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/free-abs-tshirt-roblox_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/free-onine-dater-clothes-roblox_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/how-to-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/roblox-how-to-get-catalog-items-for-free_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/how-to-hack-roblox-one-punch-man_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/cheat-roblox-robux-2021_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/hacked-roblox-game_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/mad-city-roblox-money-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/hacks-minecraft_GM479516143.pdfIn PDF document text
    • http://183.91.70.11/repository/free-robux-without-downloading-anything_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_off00002f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F37 21556 bytes
SHA-256: 838b3f443df1e1911cd863895266feea3fe70c19f78481b60c5b7500c0035f20
font_01_sfnt_off00005e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E7F 19220 bytes
SHA-256: c918620fe1ac7a9dd951a4087787ad0c1c0482e04f38876a98c43c7428c457a6

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