PDF malware analysis — malicious · 83107a90a2903768

MALICIOUS

PDF

47.9 KB Created: 2021-05-13 13:03:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07

MD5: c7d7f3ba6ce79012b2d37514e5f424a5 SHA-1: 64c06f1f78b23cc231187a9cbd18682f78e25e6b SHA-256: 83107a90a2903768d95483278cde6dcf56a402dd2bd2fc8cd9ffa07b9b080f8a

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically targeting users with lures for game hacks and currency. The primary link, 'https://netcdn.xyz/app/431946152/get-free-robux-without-doing-anything-game-hack', is flagged as a malicious redirector. The document body and embedded URLs reinforce this lure, suggesting an attempt to trick users into visiting potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9013

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/431946152/get-free-robux-without-doing-anything-game-hack In PDF document text
- https://vosco.vn/uploads/vosco.vn/files/my-minecraft-account-was-hacked_GM479516143.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/roblox-com-hack_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/free-robux-microsoft_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/coin-master-online-hack_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/is-free-robux-real_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/hacks-master-coin_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/robux-money_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/coin-master-hack-app-ios_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/coin-master-jackpot-hack_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/hack-master-coin-pc_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/coin-master-hack-com_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/is-there-a-free-version-of-minecraft_GM479516143.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/robux-free-promo-codes_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/roblox-a_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/coin-master-hacks-no-human-verification_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/is-minecraft-java-edition-free_GM479516143.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_003_off000049ab.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x49AB	28072 bytes
SHA-256: `5cbc59adf196fce91ff9e8bc870a8b02726e751c75d958e8a1ae2f42732a2d64`
`font_01_sfnt_off00008969.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8969	3884 bytes
SHA-256: `40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf`
`font_02_sfnt_off00009611.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9611	19240 bytes
SHA-256: `a9e3aa10522a438dd9eef37bb3e7f322f16e38379d063b4a50e22a05dda2bc13`

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