Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eca2dbc0db16452…

MALICIOUS

PDF

41.2 KB Created: 2021-05-14 06:06:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 019c69b42602669890600513cf464150 SHA-1: 3c79a0d369bcc6037ff269bf8a35a4ee56260dc0 SHA-256: 4eca2dbc0db164527ec7b940c7749dd06e60590411f3c426a308d99170346698
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirectors and a large number of SEO-optimized PDF files, indicating a campaign to lure users to potentially malicious content. The primary lure appears to be related to game hacks and in-game currency generators. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest a malicious intent to redirect users to further stages of an attack, possibly involving malware download or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 https://netcdn.xyz/app/431946152/robux-hack-tools-game-hack In PDF document text
    • https://www.twpuc.com.tw/upload/files/the-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/how-to-change-your-username-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/how-to-get-free-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/robux-generators-that-actually-work_GM431946152.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/sites-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/coin-master-free-cards-link-2021-today_GM406889139.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/coin-master-free-gift-links-2021_GM406889139.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/coin-master-spin-and-coins-free_GM406889139.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/robux-come_GM431946152.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/free-premium-roblox_GM431946152.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/coin-master-100-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/coin-master-money-hack_GM406889139.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/try-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/how-to-get-gold-cards-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/free-coins-and-spins-for-coin-master-game_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
stream_003_off000047fc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47FC 24048 bytes
SHA-256: 2c209461a66a3bf1f4c1f05913b2c7d658caf4e9743f65309ea8f170a839e504
font_01_sfnt_off00007e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E74 18320 bytes
SHA-256: cf6d0fcc2a7c18e0ae1e84145e037068603b130caaef77e993c358e364abbe1e

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