PDF malware analysis — malicious · a525bcd84a400703

MALICIOUS

PDF

45.3 KB Created: 2021-05-11 07:01:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31

MD5: 4f452a2ff3c1086c7b1460f15d0042d3 SHA-1: 7e5d3048a81262e8a533abb1cafe63239e0386d9 SHA-256: a525bcd84a400703b11b00c7d808322faa1be826a431aff2786d8fd6e0201dae

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains and external PDF files, masquerading as "game hacks" or "free generators" to entice users. The heuristic firings indicate a malicious redirector infrastructure and a link farm designed for SEO manipulation. While no scripts were explicitly extracted, the nature of the links suggests a potential for further malicious downloads or redirection to phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9507

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-daily-rewards-link-game-hack In PDF document text
- http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
- http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-coins-2021-coin-master-link_GM406889139.pdfIn PDF document text
- http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-free-gold-cards-link-2021ee-spins_GM406889139.pdfIn PDF document text
- http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-free-online_GM406889139.pdfIn PDF document text
- http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/how-can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
- http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/how-to-change-roblox-username-for-free_GM431946152.pdfIn PDF document text
- http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/minecraft-hacker-mask_GM479516143.pdfIn PDF document text
- http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-hack-mod-apk-android-1_GM406889139.pdfIn PDF document text
- http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-robux-working_GM431946152.pdfIn PDF document text
- http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-free-spins-2021-ios_GM406889139.pdfIn PDF document text
- http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
- http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/minecraft-free-demo_GM479516143.pdfIn PDF document text
- http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
- http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
- http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/how-can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
- http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-printable-roblox-images_GM431946152.pdfIn PDF document text
- http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-card-collection-hack_GM406889139.pdfIn PDF document text
- http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
- http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/how-do-i-get-robux_GM431946152.pdfIn PDF document text
- http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-money-and-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_003_off00004c32.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4C32	24312 bytes
SHA-256: `e278dec3912de0d375b08b4c3c0ab2c1a5d63f5858850a3f020c9af9074ec155`
`font_01_sfnt_off000083f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x83F8	2880 bytes
SHA-256: `10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132`
`font_02_sfnt_off00008de3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8DE3	18476 bytes
SHA-256: `07588acd188e94840ee3d81838fc3eb86fea3d6b92df8a2ea6dbf9420e3d87dc`

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