Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55d71a270b29dbe…

MALICIOUS

PDF

44.1 KB Created: 2021-05-12 15:01:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e0b17b13cfaf2239f7ec3909f3e41b26 SHA-1: bdcd8244b2b868c0ce14d0edc32104518f04076e SHA-256: c55d71a270b29dbee5bc8733c8b10b2f25e5103a2be930e6a11ebe18472e84fb
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites promising game hacks and cheats, indicating a lure for users to visit potentially malicious sites. The heuristic 'PDF_SEO_LINK_FARM' suggests a large number of these links are present, likely to drive traffic to these scam sites. While no scripts were extracted, the embedded URLs and the nature of the lures strongly suggest a phishing or scamming attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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 https://netcdn.xyz/app/479516143/how-to-hack-minecraft-pe-game-hack PDF link annotation
    • https://info-zentr.ru:443/images/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://info-zentr.ru:443/images/roblox-online-free-no-download_GM431946152.pdfIn PDF document text
    • https://info-zentr.ru:443/images/roblox-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://info-zentr.ru:443/images/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • https://info-zentr.ru:443/images/coin-master-hack-account_GM406889139.pdfIn PDF document text
    • https://info-zentr.ru:443/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://info-zentr.ru:443/images/roblox-svg-free_GM431946152.pdfIn PDF document text
    • https://info-zentr.ru:443/images/coin-master-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • https://info-zentr.ru:443/images/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • https://info-zentr.ru:443/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://info-zentr.ru:443/images/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://info-zentr.ru:443/images/free-coin-master-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • https://info-zentr.ru:443/images/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://info-zentr.ru:443/images/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://info-zentr.ru:443/images/login-robux_GM431946152.pdfIn PDF document text
    • https://info-zentr.ru:443/images/minecraft-games-free-to-play-online_GM479516143.pdfIn PDF document text
    • https://info-zentr.ru:443/images/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
    • https://info-zentr.ru:443/images/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://info-zentr.ru:443/images/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • https://info-zentr.ru:443/images/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://www.freenom.comHeyIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000049b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49B6 24192 bytes
SHA-256: 7d1577b1ba3248d48cae553e52701c72c331beea1821624eec4d221aacfa7a4e
font_01_sfnt_off00008017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8017 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A01 18196 bytes
SHA-256: d34ad1dbd9dd4a0600043f837e3a6c6fdafb13b781254d1b565cb7d4b46c75dd

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