Malicious PDF — malware analysis report

Static analysis result for SHA-256 7367dbe533f63507…

MALICIOUS

PDF

33.2 KB Created: 2021-07-04 17:10:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 82b4e03c8d6c72abdae038b7d33bba1b SHA-1: 6cd64fc24e107ee0d4e6773ac30c3360a6ec9e40 SHA-256: 7367dbe533f635073d5036bfffb6e2f859e24c6d18527f98f65e6e9f70a4dfcd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.tw/app/431946152/free-robux-just-enter-username-game-hack. This lure is designed to trick users into believing they can obtain free Robux or game hacks. The document body and embedded URLs reinforce this theme, suggesting a phishing or scam attempt to drive traffic to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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.tw/app/431946152/free-robux-just-enter-username-game-hack In PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-robux-hack-by-justin-master_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-robux-mobile_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-roblox-clothes-for-your-avatar_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/earn-robux-websites_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/roblox-cheat-robux_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/getbux-win-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-cheat-codes-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/hack-coin-master-for-iphone_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-roblox-membership-codes_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/how-to-hack-to-get-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-free-spin-reward-links_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/cheats-for-mm2-roblox_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/roblox-free-admin-hack_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_off00002a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A7C 22416 bytes
SHA-256: f8bc1fe91239b6c99d999863428930c8c4954a26274cb145e0dc8aec11acae69
font_01_sfnt_off00005ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA9 19244 bytes
SHA-256: bb42f0e36b7288fba8af59efb142b286361a630cbb1699ef387bab73f1413400

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