PDF malware analysis — malicious · 9af3fa3f8a452809

MALICIOUS

PDF

47.6 KB Created: 2021-06-13 14:58:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13

MD5: 983e61783a6b2d8050ca418ee8e90618 SHA-1: aac78f122fe0ac5c5665a431b04763c3a172f880 SHA-256: 9af3fa3f8a45280988f1f33edb0d82f491c0e3cd2496a17d0c424aa1ed7990f4

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites offering 'free hacks' and in-game currency, indicative of a phishing or scam lure. The heuristic firings confirm the presence of malicious redirectors and a link farm designed to attract users with deceptive content. While no scripts were explicitly extracted, the structure and embedded URLs suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9769

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.co/app/431946152/free-followers-hack-roblox-game-hack In PDF document text
- http://urbanposthotel.com/admin/ckfinder/userfiles/files/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
- http://urbanposthotel.com/admin/ckfinder/userfiles/files/is-minecraft-education-edition-free_GM479516143.pdfIn PDF document text
- http://urbanposthotel.com/admin/ckfinder/userfiles/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
- http://urbanposthotel.com/admin/ckfinder/userfiles/files/offers-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
- http://urbanposthotel.com/admin/ckfinder/userfiles/files/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
- http://urbanposthotel.com/admin/ckfinder/userfiles/files/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
- http://urbanposthotel.com/admin/ckfinder/userfiles/files/ultimate-free-spins-coin-master_GM406889139.pdfIn PDF document text
- http://urbanposthotel.com/admin/ckfinder/userfiles/files/minecraft-gun-games-free_GM479516143.pdfIn PDF document text
- http://urbanposthotel.com/admin/ckfinder/userfiles/files/coin-master-deals_GM406889139.pdfIn PDF document text
- http://urbanposthotel.com/admin/ckfinder/userfiles/files/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
- http://urbanposthotel.com/admin/ckfinder/userfiles/files/free-tiktok-followers-500_GM835599320.pdfIn PDF document text
- http://urbanposthotel.com/admin/ckfinder/userfiles/files/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
- http://urbanposthotel.com/admin/ckfinder/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
- http://urbanposthotel.com/admin/ckfinder/userfiles/files/coin-master-daily-link_GM406889139.pdfIn PDF document text
- http://urbanposthotel.com/admin/ckfinder/userfiles/files/coin-master-hack-cheat-generator-d_GM406889139.pdfIn PDF document text
- http://urbanposthotel.com/admin/ckfinder/userfiles/files/roblox-verification_GM431946152.pdfIn PDF document text
- http://urbanposthotel.com/admin/ckfinder/userfiles/files/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
- http://urbanposthotel.com/admin/ckfinder/userfiles/files/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
- http://urbanposthotel.com/admin/ckfinder/userfiles/files/pokemon-go-free-96-iv_GM1094591345.pdfIn PDF document text
- http://urbanposthotel.com/admin/ckfinder/userfiles/files/free-spins-on-coin-master-2021_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_off00004e1e.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4E1E	26268 bytes
SHA-256: `c89c8ce89156700d6bbd6c7be6ac7cb1bb5180a107fb2b3bd31f170957c2cf60`
`font_01_sfnt_off000089f3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x89F3	5596 bytes
SHA-256: `9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5`
`font_02_sfnt_off0000969b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x969B	18512 bytes
SHA-256: `a23c4fb328c765d5dfa3f87e0ca4ea3e355c7ae056261b2b3cd2e9ecca6fa405`

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