Malicious PDF — malware analysis report

Static analysis result for SHA-256 55fa2626602df8de…

MALICIOUS

PDF

34.4 KB Created: 2021-07-05 06:55:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d4e48edc2899cd5564eb6605d900a966 SHA-1: 58a0c9edbc5cb39280cba12bc43caf51b7ef3879 SHA-256: 55fa2626602df8de4cf8625e982aa6ac0ccf12bc4afbdee9d590b425116db790
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to malicious redirectors and other PDFs, masquerading as game hacks and generators. The primary lure is a "free generator / game hack" for Roblox, which leads to the URL http://netcdn.tw/app/431946152/roblox-is-being-hacked-9-21-2021-game-hack. This URL is part of a chain of malicious redirectors and further malicious PDF files hosted on domains like htdvn.com.

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.tw/app/431946152/roblox-is-being-hacked-9-21-2021-game-hack In PDF document text
    • https://htdvn.com/public/upload/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-coins-on-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/hack-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/minecraft-hacker-mask_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-sans-face-roblox_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-robux-com_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/levvvel-coin-master_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-hack-ios-12_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/minecraft-classic-free_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-free-download-for-ps4_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/minecraft-pe-free_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-card-codes-generator-roblox_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-cheats-and-hacks_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-millions-of-robux-for-free_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-cheat-engine-alternative_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F99 21888 bytes
SHA-256: fd302e7dd765fce1ceccd31985d2dfcd223b01328d51bd8a3e2e10d8905d6f88
font_01_sfnt_off00005ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFB 19516 bytes
SHA-256: 976bf0182639fbc00f145733a2c217588c79e3a0acb4c83c739a40e044a0c14f

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