PDF malware analysis — malicious · c1f9a670928aa017

MALICIOUS

PDF

45.5 KB Created: 2021-06-03 07:04:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20

MD5: d9963bfaffa50a6b2d155cc337905348 SHA-1: 7c02978ba9764080db070556594ccd3f3ebe614c SHA-256: c1f9a670928aa0177a58c206b9df809328a17a5399c79698d6a3db9d8f2c1aae

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and a large number of external PDF links, many with SEO-like slugs. The primary redirector URL is associated with 'game hacks' and 'free generators', a common lure for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9864

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.online/app/479516143/free-texture-packs-for-minecraft-pe-game-hack In PDF document text
- http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
- http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/roblox-script-hack_GM431946152.pdfIn PDF document text
- http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/minecraft-116-free-download_GM479516143.pdfIn PDF document text
- http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/http-blackgamesus-coinmasterhack_GM406889139.pdfIn PDF document text
- http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
- http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/como-hackear-coin-master-iphone_GM406889139.pdfIn PDF document text
- http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/how-to-get-free-snacks-on-coin-master_GM406889139.pdfIn PDF document text
- http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
- http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/coin-master-free-spins-ios_GM406889139.pdfIn PDF document text
- http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
- http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/hack-coin-master-apk-32-download_GM406889139.pdfIn PDF document text
- http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/free-robux-mobile_GM431946152.pdfIn PDF document text
- http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
- http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/how-many-free-spin-links-is-there-for-coin-master_GM406889139.pdfIn PDF document text
- http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
- http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/free-spins-on-coin-masters_GM406889139.pdfIn PDF document text
- http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/coin-master-hack-100-working_GM406889139.pdfIn PDF document text
- http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/do-robux-generators-work_GM431946152.pdfIn PDF document text
- http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
- http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/coin-master-hack-version-apk-download_GM406889139.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off000055b4.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x55B4	25408 bytes
SHA-256: `f913e6d200868fc66b51882fae55c4654ec13d2e444746d6c0d90882be20e01d`
`font_01_sfnt_off00008f02.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8F02	18384 bytes
SHA-256: `4bd922cb808520f712e6f68915d55ea385c9bd17e049420b207e71ca6d562f93`

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