PDF malware analysis — malicious · 13d17bbb42ed8fcb

MALICIOUS

PDF

34.3 KB Created: 2021-07-09 15:19:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13

MD5: 8a651fedd4ccda855a8d2b8be4b2edb1 SHA-1: 6ad189adb4e56a1991238e4bc6a01ba2c4b7f146 SHA-256: 13d17bbb42ed8fcbcf6832f61263808b1b35bffedb9432a02f9502c2b93c6427

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a malicious redirector and a link farm of other scam PDFs, all designed to lure users into clicking on deceptive content related to free game items. The primary redirector URL is http://netcdn.tw/app/406889139/free-coin-master-cards-link-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a social engineering attack aimed at driving traffic to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/free-coin-master-cards-link-game-hack In PDF document text
- https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/free-roblox-accounts-with-robux-discord_GM431946152.pdfIn PDF document text
- https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/haktuts-coin-master_GM406889139.pdfIn PDF document text
- https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
- https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
- http://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
- https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
- http://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/why-are-free-robux-games-on-front-page_GM431946152.pdfIn PDF document text
- https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/www-free-robux_GM431946152.pdfIn PDF document text
- https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/how-to-hack-robux-from-someone_GM431946152.pdfIn PDF document text
- https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/free-spin-link-of-coin-master_GM406889139.pdfIn PDF document text
- https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/roblox-slurp-hack-download_GM431946152.pdfIn PDF document text
- https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/pubg-uc-jazz-cash_GM1330123889.pdfIn PDF document text
- http://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/coin-master-hack-xyz-apk-download_GM406889139.pdfIn PDF document text
- https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
- https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
- http://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/free-unlimited-coin-master-online-tool_GM406889139.pdfIn PDF document text
- http://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
- https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/how-do-you-hack-for-2021000-coins-on-flip-master_GM406889139.pdfIn PDF document text
- https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/moonactive-coin-master_GM406889139.pdfIn PDF document text
- http://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/abstract-hack-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.

Filename	Kind	Source	Size
`stream_002_off00003047.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3047	22764 bytes
SHA-256: `66398eb544b9cba2dabef52fb5a57b87f6f41abe33c1270dce56033c6166c036`
`font_01_sfnt_off00006339.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6339	18340 bytes
SHA-256: `b2017717319ed1cc4a90f63cde4a7ca53e868056cc2e1441a2f5bc7eaddf4cbd`

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