PDF malware analysis — malicious · a1f327f89ce97430

MALICIOUS

PDF

45.8 KB Created: 2021-05-14 19:02:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21

MD5: 035c577ec72371a27baa3d57b5c84a8a SHA-1: 81c3480f16de76af54c4ebff109d62b96155a61d SHA-256: a1f327f89ce97430c59495765aa273c5d746c692c81941152a5145e80e727436

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure and SEO-optimized PDF files, all related to game hacks and free spins. The heuristic firings indicate these links lead to known malicious redirectors and a link farm. The document body, though partially corrupted, contains a primary URL that appears to be part of this lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9432

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.xyz/app/406889139/coin-master-free-spins-link-hack-game-hack In PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/minecraft-app-store-free_GM479516143.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/coin-master-gold-cards-hack-english_GM406889139.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/coin-master-free-2021-spin-link-today_GM406889139.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/rbx-earn_GM431946152.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/coin-master-levels_GM406889139.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/toolbox-for-minecraft-pe-ios_GM479516143.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/can-you-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/coin-master-free-spin-best-link_GM406889139.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/coin-master-hack-download-android_GM406889139.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/free-coin-master-hacks_GM406889139.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/free-roblox-gift-card_GM431946152.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/is-roblox-free-on-nintendo-switch_GM431946152.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/www-rbxhut-com_GM431946152.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/how-to-get-free-robux-codes_GM431946152.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_off00004d6c.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4D6C	24900 bytes
SHA-256: `a8772bf9c4f709b2a5ef67f4226d1fbdc8f2b5fcd5e2925f7c1ef3caa52896a0`
`font_01_sfnt_off00008744.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8744	2924 bytes
SHA-256: `89b375b3099c16285f8fe3c63d3b9e52cb99b52dd2caab822764707661633145`
`font_02_sfnt_off00009157.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9157	18056 bytes
SHA-256: `654168d3b6bcb61be570e1238605831ee66fed80d87ac67967dd188319cba9ee`

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