Malicious PDF — malware analysis report

Static analysis result for SHA-256 be603d771a179042…

MALICIOUS

PDF

43.4 KB Created: 2021-06-11 02:40:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d608c552ee2794fb48cb743d11350dd6 SHA-1: 8253d54b63c2b0a518aa5fddea0471f0d1cae41b SHA-256: be603d771a179042d2f6e00ad2d7cabc14fbefc380dc45d9cc274885156f8738
212 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 santeh-40.ru and appear to be part of a link farm designed to attract users searching for game hacks and free in-game currency. One prominent link redirects to a URL associated with free Robux generators, a common lure for phishing or malware distribution. The presence of multiple redirector links and the ML classifier's high confidence score indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • 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.
  • 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/easy-no-survey-free-robux-game-hack In PDF document text
    • http://santeh-40.ru/images/hack-coin-master-apk-32-download_GM406889139.pdfIn PDF document text
    • http://santeh-40.ru/images/roblox-online-free_GM431946152.pdfIn PDF document text
    • http://santeh-40.ru/images/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • http://santeh-40.ru/images/coin-master-apk-mod-free-download_GM406889139.pdfIn PDF document text
    • http://santeh-40.ru/images/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://santeh-40.ru/images/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://santeh-40.ru/images/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://santeh-40.ru/images/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://santeh-40.ru/images/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://santeh-40.ru/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://santeh-40.ru/images/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://santeh-40.ru/images/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://santeh-40.ru/images/coin-master-download-hack_GM406889139.pdfIn PDF document text
    • http://santeh-40.ru/images/robux-earning-websites_GM431946152.pdfIn PDF document text
    • http://santeh-40.ru/images/how-to-get-free-coins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://santeh-40.ru/images/buy-free-robux-roblox_GM431946152.pdfIn PDF document text
    • http://santeh-40.ru/images/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://santeh-40.ru/images/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://santeh-40.ru/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://santeh-40.ru/images/is-it-possible-to-get-free-robux_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
stream_004_off0000535a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x535A 26016 bytes
SHA-256: 4a0f99c8734a0f3b21924ea90b10eaea24c0fd759857b58b1ba20733e1f838b6
font_01_sfnt_off00008dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD2 18536 bytes
SHA-256: c212b1036c0c6dfdf2d40f386b32565df2834b3c77969850f9674190a73d57ae

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