Malicious PDF — malware analysis report

Static analysis result for SHA-256 112eebf118c4d6eb…

MALICIOUS

PDF

46.3 KB Created: 2021-06-13 23:12:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: de19a7e53f3f253b1c92ef81fc59b087 SHA-1: b8e4a4079616526a4261bc99a87f34e9d0c09f52 SHA-256: 112eebf118c4d6eb8c5bcdd4f4ae6d2212a62009b374ac7d29747373b5c67c97
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting game hacks and cheats. The document body and embedded URLs suggest a lure to download potentially malicious files or visit further compromised sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.co/app/431946152/roblox-bubblegum-simulator-cheats-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spins-on-coin-masters_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-100-spin-hack_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-just-click_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-creative-mode-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/hack-coin-master-site-rssingcom_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-comroblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-cheat-engine-scripts-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hacks-that-work_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spin-coin-master-app-download_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/mosttechs-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-that-actually-works_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-daily-rewards_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/what-do-points-do-in-roblox_GM431946152.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_off00004bb4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BB4 29860 bytes
SHA-256: 1e91c71b03bef912215e96300daa30a1d8cad81cfd70a80486e49045cca71ed4
font_01_sfnt_off00009072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9072 19088 bytes
SHA-256: fd0408c12dfd336ebfb5bc59e3c096ffd3c832d561969993b8020fed5f02ac34

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