Malicious PDF — malware analysis report

Static analysis result for SHA-256 aedf4058e412e564…

MALICIOUS

PDF

41.4 KB Created: 2021-05-14 22:59:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 2814e4bc48f1209167f5a3c903e418d8 SHA-1: f77b53bf091e3b9a987ddfae45b3118d67d2af1a SHA-256: aedf4058e412e564630a2d969e8c4d68d55a8a9f7e4e91428fbdc3c6a6a4e010
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to external sites, including a primary redirector at 'netcdn.xyz' and a large number of SEO-optimized PDF links hosted on 'sunnygarden.com.tw'. These links are designed to lure users into clicking on potentially malicious content, such as game hacks or free item generators, which is a common tactic for phishing and scam campaigns. The ML classifier strongly supports the malicious nature of this PDF.

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/479516143/was-minecraft-ever-free-game-hack In PDF document text
    • https://sunnygarden.com.tw/image/data/files/wurst-112-2_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-freebies-2021_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-redeem-code_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/freespincoin-masterlinkdownload_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-gold-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-get-free-cards_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-hack-no-download_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/robux-generator-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/8bp-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-coins-amp_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-spins-link-ios_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/robux-in_GM431946152.pdfIn PDF document text
    • https://sigmaclient.info#2In PDF document text
    • https://flux.today#3In 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_off0000488f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x488F 24564 bytes
SHA-256: 7ea640c1850f64ef35f358bde75248d61cf338798eab5d74e862d1a69a08df86
font_01_sfnt_off000080bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80BC 17880 bytes
SHA-256: fa9564ce5793f03604dae66ea4261aaef87f9e1e7420b634dd5196a1b51aa919

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