Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a3b0afb412bbbb…

MALICIOUS

PDF

32.1 KB Created: 2021-06-22 01:11:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7c6aef60004d55d4c24c307d5b03fd19 SHA-1: a10ffa73c432a721e9c6c8f707b5aaf1258ed464 SHA-256: 81a3b0afb412bbbbb8a55ef646d6c37afa79be899b7a4ac977e15c7dec4062af
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links disguised as game hacks and generators, including a primary link to 'netcdn.co'. These links are identified as malicious redirectors, suggesting the document's purpose is to lure users to malicious websites. No scripts were extracted, but the embedded URLs and the nature of the lures strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.
  • 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 http://netcdn.co/app/431946152/how-to-hack-in-roblox-games-2021-game-hack In PDF document text
    • https://nhaphangjapan.vn/public/upload/files/coin-master-hack-online-2021_GM406889139.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/roblox-titan-simulator-hack_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/free-robuxgg-hack_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/free-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/roblox-robux-generator-free-2021_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/minecraft-free-app_GM479516143.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/free-robux-site_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/coin-and-spin-link_GM406889139.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/coin-master-hack-download-android_GM406889139.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/how-to-hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/minecraft-free-version-pc_GM479516143.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/best-way-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/daily-spin_GM406889139.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/coin-master-mod-version-free-download-2021_GM406889139.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/links-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/coin-master-hack-1021_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
font_00_sfnt_off00002951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2951 21056 bytes
SHA-256: 4d38b9cb2c2ec7061ad42537b863bcc9d56efab22f08622bd8487b6be149e8b5
font_01_sfnt_off000056fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56FE 19480 bytes
SHA-256: c0cb98ba9066e0048dce8d5a50c242bf12ec2e1395ba821c89c096fa9916bc8b