PDF malware analysis — malicious · 6aa654e7ab0a441b

MALICIOUS

PDF

36.1 KB Created: 2021-07-04 05:37:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13

MD5: c5ed653ee44f6e42fec0b2a331dcad5c SHA-1: 6cb69f414124d3bc4a90b434d5b0874458f226df SHA-256: 6aa654e7ab0a441b50aab85fac7103dbb18fe25a39663c1f07822f5f2a4bb87d

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure and a large number of SEO-optimized PDF files, likely intended to drive traffic to malicious sites or distribute further malware. The presence of a 'download button' heuristic suggests a lure to trick users into clicking malicious links. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious redirection campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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.tw/app/431946152/avatar-the-last-airbender-roblox-game-hack In PDF document text
- https://maths-pdf.fr/ckfinder/userfiles/files/coin-master-free-spin-links-december-30-2021_GM406889139.pdfIn PDF document text
- https://maths-pdf.fr/ckfinder/userfiles/files/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
- https://maths-pdf.fr/ckfinder/userfiles/files/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
- https://maths-pdf.fr/ckfinder/userfiles/files/coin-master-free-spins-reddit_GM406889139.pdfIn PDF document text
- https://maths-pdf.fr/ckfinder/userfiles/files/free-robux-app_GM431946152.pdfIn PDF document text
- https://maths-pdf.fr/ckfinder/userfiles/files/hacke-bubble-gum-simulator-de-roblox_GM431946152.pdfIn PDF document text
- https://maths-pdf.fr/ckfinder/userfiles/files/free-robux-instantly_GM431946152.pdfIn PDF document text
- https://maths-pdf.fr/ckfinder/userfiles/files/group-funds-free-robux_GM431946152.pdfIn PDF document text
- https://maths-pdf.fr/ckfinder/userfiles/files/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
- https://maths-pdf.fr/ckfinder/userfiles/files/free-spins-coin-master-links-twitter_GM406889139.pdfIn PDF document text
- https://maths-pdf.fr/ckfinder/userfiles/files/roblox-crashes-every-time-i-run-cheat-engine_GM431946152.pdfIn PDF document text
- https://maths-pdf.fr/ckfinder/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
- https://maths-pdf.fr/ckfinder/userfiles/files/free-mods-for-minecraft-pe_GM479516143.pdfIn PDF document text
- https://maths-pdf.fr/ckfinder/userfiles/files/free-tiktok-likes-and-views_GM835599320.pdfIn PDF document text
- https://maths-pdf.fr/ckfinder/userfiles/files/roblox-how-to-get-free-packages_GM431946152.pdfIn PDF document text
- https://maths-pdf.fr/ckfinder/userfiles/files/how-do-you-get-free-robux-on-survey_GM431946152.pdfIn PDF document text
- https://maths-pdf.fr/ckfinder/userfiles/files/minecraft-linux-free_GM479516143.pdfIn PDF document text
- https://maths-pdf.fr/ckfinder/userfiles/files/roblox-hack-com_GM431946152.pdfIn PDF document text
- https://maths-pdf.fr/ckfinder/userfiles/files/how-to-hack-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
- https://maths-pdf.fr/ckfinder/userfiles/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
- https://www.roblox.com/.IIn 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
`font_00_sfnt_off000035f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x35F8	22340 bytes
SHA-256: `3fffe000623f4a2a6e74b4f912d1a07ec9017b7a3f5ef15bd32be3720ad3b893`
`font_01_sfnt_off000067bd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x67BD	19164 bytes
SHA-256: `e5caef92e10acfe475c8e4ac8f61f43e5b3c6f19c7213382c9bcf75c0cc4362e`

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