Malicious PDF — malware analysis report

Static analysis result for SHA-256 efafd2b39f483c69…

MALICIOUS

PDF

45.4 KB Created: 2021-06-03 08:55:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 1dd284690c9d061c8abdd560c27c19ea SHA-1: a3309f6bf52849d7f82361399b89d6953508906f SHA-256: efafd2b39f483c69bcb37df43c70e50c3d3684cc2b70055edf6887542fbf33b1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, including one that masquerades as a game hack generator. The document body and embedded URLs suggest a lure for free in-game currency or hacks, which is a common social engineering tactic. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.online/app/479516143/how-do-you-hack-minecraft-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-coinmaster-spins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-minecraft-mods-for-ps4_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/wwwcoin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/claim-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/robux-generator-that-works_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-rewards-2021_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_004_off00005552.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5552 25380 bytes
SHA-256: 671f96e151a0f588df581bcb8b66f80b69869276f678bec1597e69d15807776d
font_01_sfnt_off00008e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E6F 18512 bytes
SHA-256: 3291eec6b86d740bab8ba76643ef34913a0c4ab2a930ce2f65b8b3fd60c7ead6

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