Malicious PDF — malware analysis report

Static analysis result for SHA-256 488a16695d8ae9d9…

MALICIOUS

PDF

33.0 KB Created: 2021-07-04 23:06:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 62bc7bbf9055cab605cbec70e7c675cd SHA-1: 6e6cab5836673261a43d7d5f4b9337895df11b8c SHA-256: 488a16695d8ae9d9011181d51bedc3c2b527f767f9c51ddf1b4f42736bc2e0bd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of game hacks and free currency. The primary link, http://netcdn.tw/app/431946152/robux-cheat-game-hack, is identified as a malicious redirector. The document body and embedded URLs suggest a social engineering tactic to drive traffic to potentially malicious sites for further exploitation or credential harvesting.

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/robux-cheat-game-hack In PDF document text
    • https://key8013805.com.tw/upload/files/free-robux-rewards_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/roblox-give-btools-with-cheat-enigene_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/how-to-hack-in-roblox-prison-life-20_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/coin-master-cheats-free-spins_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/characters-roblox-free_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-robux-generator-addon_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/hack-for-gta-roblox_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-robux-no-rewards_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/cm-free-spin-link-today_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/the-community-hacker-roblox_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-blank-roblox-shirt-templates_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/get-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/gold-card-coin-master-free_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/roblox-inappropriate-games_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/aaroboy-10-hacker-roblox_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/freespinandcoin-blogspot-com_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/unlimited-robux-cheat_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/coin-master-free-cards-hack_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_off00002d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D28 21592 bytes
SHA-256: 940a34b2e53382d907013ff8bedc27f100b1987673ad77ba60ec73c07448442b
font_01_sfnt_off00005c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C6D 18820 bytes
SHA-256: 37f2cbed7862a525c1327ce05c27341cf40a6b7f3d64c9c700a10f02169ccde8

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