Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb11d3f22b19cc87…

MALICIOUS

PDF

45.5 KB Created: 2021-05-13 20:55:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ca39091bcfd7413868ead07280fb7651 SHA-1: 5899fa68b059e1e3e14d638cfc33304a92def722 SHA-256: eb11d3f22b19cc87a154c9f518bd4a205d6d4e0150427789a7621c6780f91fa7
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, disguised as game hacks and free currency generators. The ML classifier also flagged this PDF with high confidence. The embedded links likely lead to a second-stage download or exploit, aiming to compromise the user's system. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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.xyz/app/479516143/minecraft-xbox-one-free-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-unlimited-robux_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/freegames911com-coinmastertipsandcheats2021freecoinsandspins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-fast-org_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-new-cards-hack_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spins-for-iphone_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-coins-and-spins-group_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/descargar-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/robux-earning-sites_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-build-hacks_GM479516143.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b9f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B9F 25440 bytes
SHA-256: 630b0ef62a930fdddd724d80e34e31ec5fe0c548d45e7cf5f04585b4ca89ded1
font_01_sfnt_off00008560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8560 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off00008f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F70 18304 bytes
SHA-256: c1e2eae75883489521c63816ae5be98a5c25b5d6a823037780a07f542a635aab

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