Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79b49febd1568bf…

MALICIOUS

PDF

34.4 KB Created: 2021-06-28 01:54:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 157a8e37d0e250fe9f20476581f9328c SHA-1: 542b26410112fdd5a1cfa52dae8f17de5d7b0036 SHA-256: a79b49febd1568bf987652d36857f4913c44b8c0ad88869d9b6fea760d669165
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs, with a primary link to 'netcdn.co' identified as a malicious redirector. The document body and heuristics suggest a lure for game-related cheats or currency, indicating a phishing or scam attempt. While no scripts were explicitly extracted, the nature of the embedded links and the lure strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/free-roblox-printable-valentines-cards-game-hack In PDF document text
    • http://www.my-travel.com.hk/upload/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/get-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/free-roblox-girl-hair-not-a-model_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/free-roblox-promocode-for-robux-july-2021_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/no-human-verification-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/be-a-parkour-ninja-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/hacks-for-tresure-hunt-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/is-uc-pubg_GM1330123889.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/coin-master-mod-apk-free-download-for-android_GM406889139.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/coin-master-daily-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/oginject-co_GM406889139.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/offers-for-robux_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.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_off00002f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F64 22108 bytes
SHA-256: dc241c4fd51b6d18b15891b0b83f95d21f2d505a4e8f0c28f43612966a87c0d7
font_01_sfnt_off0000608a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x608A 19336 bytes
SHA-256: 7bdafdd0987278dca4721ff7a0943f09046d116b1dfc79df6c0130638ea1ee66