Malicious PDF — malware analysis report

Static analysis result for SHA-256 26bc3ee73c1ff7d6…

MALICIOUS

PDF

33.8 KB Created: 2021-06-18 02:59:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 39b7313730c182872ea66bd74fcf4f0e SHA-1: c6e18289db153214aa9a9be43dbeee0e37fdb97e SHA-256: 26bc3ee73c1ff7d6cf6169178bbf1e3faf6d01119bbe9549cfd42bed25d76efe
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on sbm-nn.ru and appear to be part of a link farm designed to attract users searching for game hacks and free in-game currency for Roblox. The primary lure is the promise of 'free gold chain' or other game advantages. While no scripts were explicitly extracted, the PDF structure and the high number of embedded URLs suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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/roblox-free-gold-chain-game-hack PDF link annotation
    • http://sbm-nn.ru/images/free-roblox-hair-to-wear_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-roblox-toys_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-download-vermillion-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-free-robux-no-survey-no-password_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-hack-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/the-plaza-roblox-money-cheat_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-make-shirt-in-roblox-free_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/game-explorer-roblox-hack-pastebin_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/kron-hack-for-roblox_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-roblox-card_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/hack-coin-master-apk-358_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/husky-800m-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-robux-hack-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-co_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-fan-page-facebook_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spin-and-trading_GM406889139.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
stream_002_off00002d55.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2D55 22480 bytes
SHA-256: 8204115344585a8fe1b2af04ca7e0efb7edab17778bc240b51f3ac154e3020e5
font_01_sfnt_off00005fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAB 18924 bytes
SHA-256: ac397e38293e1dd804cf2ba1d9ca740e785e9835d3ef740d52fbd561c36db8cc

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