Malicious PDF — malware analysis report

Static analysis result for SHA-256 4888c1764938c747…

MALICIOUS

PDF

48.4 KB Created: 2021-06-09 08:01:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d36adccbc133825d07ff6fe5ca9a1567 SHA-1: c9648066b531813aa4bc9de34ae1d689f4283493 SHA-256: 4888c1764938c74750f89619a5869781961f7366e95f52b15bbfe6ca85bb456c
228 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to known malicious redirectors and a link farm. The primary lure appears to be 'free generator / game hack' content, aiming to trick users into clicking through to download further malicious PDFs. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.tw/app/431946152/free-gear-roblox-game-game-hack In PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-free-coins-app_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-pc-hack-download_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/is-minecraft-free_GM479516143.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/pubg-uc-earning-app-2021_GM1330123889.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/pubg-uc-daraz_GM1330123889.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/moon-active-games_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/pubg-uc-wallpaper_GM1330123889.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000053a3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53A3 25244 bytes
SHA-256: e9015a028ccc86eef023d09200eebf9527ebd4ba466aa5450046cdeba54b4ddb
font_01_sfnt_off00008d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D32 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off000099da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99DA 18436 bytes
SHA-256: 6c387344173b43402c38b5b172093e87d0495a4d9108a2c6045ceefdf9abd399

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