PDF malware analysis — malicious · b4b70488ed3544ed

MALICIOUS

PDF

40.9 KB Created: 2020-09-02 16:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 04defff8b431624b9c398727771f9b2e SHA-1: 5c907fad7ffb33ae567934966f51a7f8b83d5b36 SHA-256: b4b70488ed3544edbf6c785f9e75171e6d3ed36c1a21576bbddd311149332921

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=starbucks+financial+ratio+analysis+report'. This URL is likely used to redirect users to a malicious site for phishing or malware delivery. The document also contains a PDF link farm heuristic, indicating a large number of external links, with the first being 'https://cdn.shopify.com/s/files/1/0439/4529/6027/files/converting_units_of_time_worksheet_grade_4.pdf'. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector URL is sufficient evidence for a phishing or malware distribution attack pattern.

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=starbucks+financial+ratio+analysis+report
- https://cdn.shopify.com/s/files/1/0439/4529/6027/files/converting_units_of_time_worksheet_grade_4.pdf
- https://cdn.shopify.com/s/files/1/0435/9448/1821/files/volenav.pdf
- https://cdn.shopify.com/s/files/1/0427/6341/9814/files/revefup.pdf
- https://cdn.shopify.com/s/files/1/0435/2638/9912/files/33272301405.pdf
- https://static.usrfiles.com/ugd/39cb9d_02c20c79535844c5958e48e80cd3b14a.pdf
- https://static.usrfiles.com/ugd/f64db8_c74fdc9e1748440ea62bbeef0e76c697.pdf
- https://cdn.shopify.com/s/files/1/0431/4424/9499/files/neluvojofe.pdf
- https://cdn.shopify.com/s/files/1/0428/5490/8071/files/lezoxemugeximid.pdf
- https://cdn.shopify.com/s/files/1/0430/1992/7713/files/warhammer_40k_8th_edition_download_free.pdf
- https://cdn.shopify.com/s/files/1/0436/3649/0398/files/jofakodepajagigimo.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tipibag.pdf
- https://cdn.shopify.com/s/files/1/0433/6720/2974/files/the_norton_anthology_of_american_literature.pdf
- https://cdn.shopify.com/s/files/1/0431/2370/3969/files/4953233674.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00005f27.bin` `7f00dc4a6c03cc02648836292cb65586a022187d7a8e307a45644e7ca6b8d100`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5F27	5420 bytes
`font_01_sfnt_off000071ad.bin` `d731133f93a47e09e2b0ec89ee9133ab67bf2444e83348b71b9755dc931592a2`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x71AD	10968 bytes

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