PDF malware analysis — malicious · 8623ca2fb7a39753

MALICIOUS

PDF

48.0 KB Created: 2021-06-08 17:25:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13

MD5: 49f7db896925c400b4a08edf0346cfaa SHA-1: 6d1fb9dd3a8dc280b88400be5a2dcaf662faeea2 SHA-256: 8623ca2fb7a39753e82c932ad4fabd00a20aa3ab8e5178951ca58535f10aa4ac

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document contains multiple links to malicious redirectors and SEO link farms, masquerading as generators for in-game currency or hacks. The primary lure is related to 'Roblox Free Gift Cards 2021' and 'Coin Master Free Spins', directing users to URLs such as https://netcdn.tw/app/431946152/roblox-free-gift-cards-2021-game-hack. The document's structure and embedded links strongly indicate a phishing or scam campaign designed to lead users to potentially harmful websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.tw/app/431946152/roblox-free-gift-cards-2021-game-hack In PDF document text
- http://uas.com.my/uploaded_files/userfiles/files/coin-master-free-spins-link-2021-no-verification-deutsch_GM406889139.pdfIn PDF document text
- http://uas.com.my/uploaded_files/userfiles/files/coin-master-free-daily-spins-today_GM406889139.pdfIn PDF document text
- http://uas.com.my/uploaded_files/userfiles/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
- http://uas.com.my/uploaded_files/userfiles/files/how-to-change-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
- http://uas.com.my/uploaded_files/userfiles/files/online-coin-master-hack-here_GM406889139.pdfIn PDF document text
- http://uas.com.my/uploaded_files/userfiles/files/roblox-password-hacker_GM431946152.pdfIn PDF document text
- http://uas.com.my/uploaded_files/userfiles/files/free-roblox-generator_GM431946152.pdfIn PDF document text
- http://uas.com.my/uploaded_files/userfiles/files/free-spin-coin-master-link-today_GM406889139.pdfIn PDF document text
- http://uas.com.my/uploaded_files/userfiles/files/free-spins-coin-master-october-17-2021_GM406889139.pdfIn PDF document text
- http://uas.com.my/uploaded_files/userfiles/files/windows-10-minecraft-free-with-java_GM479516143.pdfIn PDF document text
- http://uas.com.my/uploaded_files/userfiles/files/free-robux-place_GM431946152.pdfIn PDF document text
- http://uas.com.my/uploaded_files/userfiles/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
- http://uas.com.my/uploaded_files/userfiles/files/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
- http://uas.com.my/uploaded_files/userfiles/files/how-to-change-your-username-in-roblox-for-free_GM431946152.pdfIn PDF document text
- http://uas.com.my/uploaded_files/userfiles/files/roblox-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
- http://uas.com.my/uploaded_files/userfiles/files/100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
- http://uas.com.my/uploaded_files/userfiles/files/coin-master-free-spins-link-quora_GM406889139.pdfIn PDF document text
- http://uas.com.my/uploaded_files/userfiles/files/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
- http://uas.com.my/uploaded_files/userfiles/files/wurst-18_GM479516143.pdfIn PDF document text
- http://uas.com.my/uploaded_files/userfiles/files/free-400-spins-coin-master_GM406889139.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off000051c3.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x51C3	24884 bytes
SHA-256: `0f0263c5bb13c2033450eb7ec2035e5de96e7cf9f2af73a4f312fb9606cd9079`
`font_01_sfnt_off00008a09.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8A09	3884 bytes
SHA-256: `40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf`
`font_02_sfnt_off000096b0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x96B0	18976 bytes
SHA-256: `a4d60524910126fdc4a2614bbb0f19a454584a3064da0ebd771b2eb7d9e0ede2`

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