PDF malware analysis — malicious · 50763fc591d1ce54

MALICIOUS

PDF

37.8 KB Created: 2020-08-02 12:39:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: b5591be3061b786112fe8e5c98f59ab0 SHA-1: 54acfd8055f27cbeb86d5b32295e21c773a39f3f SHA-256: 50763fc591d1ce543a31c8d53faf29d5e6877b748d684b5ebcb4d7af12221f2d

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm designed to appear as a legitimate download for "Rxprep 2018 pdf free download". The primary malicious URL, https://ttraff.ru/pify?keyword=rxprep+2018+pdf+free+download, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other Shopify-hosted PDFs, suggesting a SEO-based lure to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 3

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.
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://ttraff.ru/pify?keyword=rxprep+2018+pdf+free+download
- http://files.mariozaragoza.net/uploads/1/3/0/7/130776449/wagime-muvuxawi.pdf
- http://files.nenegateschool.co.uk/uploads/1/3/2/6/132695391/c33b1c8e9e0e94.pdf
- http://files.fccvideo.org/uploads/1/3/1/8/131857445/filaz-gimaxikusofew.pdf
- https://cdn.shopify.com/s/files/1/0430/4578/1665/files/48629867470.pdf
- https://cdn.shopify.com/s/files/1/0431/2167/2356/files/kofipogidotaninujag.pdf
- https://cdn.shopify.com/s/files/1/0431/9395/8560/files/zakafifegotifeful.pdf
- https://cdn.shopify.com/s/files/1/0438/8257/8088/files/tunufipavawagebugobotuz.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29318048561.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/demotufilonameviv.pdf
- https://cdn.shopify.com/s/files/1/0436/8865/7051/files/34667522874.pdf
- https://cdn.shopify.com/s/files/1/0433/6635/0998/files/noxigurabifolalo.pdf
- https://cdn.shopify.com/s/files/1/0431/6522/1028/files/20175446138.pdf
- https://cdn.shopify.com/s/files/1/0434/0331/3308/files/19634803331.pdf
- https://cdn.shopify.com/s/files/1/0432/6470/4662/files/44117817545.pdf
- https://cdn.shopify.com/s/files/1/0431/0505/8976/files/18400959845.pdf
- https://cdn.shopify.com/s/files/1/0430/2284/4067/files/rokitel.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00004776.bin` `68663bb8bfa12f80a9774a1a0b34c94443d2bbb298f20589a48e9edc96492bca`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4776	5204 bytes
`font_01_sfnt_off00005946.bin` `ceeaa3f51b493c666c1df989af21289eb7611ccf102312215aa0eb3ec7bda3c1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5946	10136 bytes
`font_02_sfnt_off00007bdd.bin` `cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7BDD	4324 bytes

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