PDF malware analysis — malicious · 2123528f3f951711

MALICIOUS

PDF

44.4 KB Created: 2020-08-30 08:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 121190aa96f7a190491ceefbde65036b SHA-1: 4190b35f07f2df400dfe0ed0d8593929d0600f0d SHA-256: 2123528f3f951711f77dd8e3794544ff719ba943e0d0e28c524a346aabe71f6b

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting a tactic to manipulate search results or distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the primary attack vector appears to be the extensive use of malicious URLs.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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.
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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.me/wix?keyword=nausicaa+of+the+valley+of+the+wind+wiki
- https://cdn.shopify.com/s/files/1/0428/2518/7491/files/monoz.pdf
- https://cdn.shopify.com/s/files/1/0433/2378/5370/files/59783130630.pdf
- https://cdn.shopify.com/s/files/1/0430/5226/9717/files/figisesofutupa.pdf
- https://static.usrfiles.com/ugd/5e81b9_befa129cb36341b4b23a048d603602a5.pdf
- https://static.usrfiles.com/ugd/f4de5e_7da9abee20d547928f754f182b854c4b.pdf
- https://cdn.shopify.com/s/files/1/0446/4692/4451/files/kingdon_agendas_alternatives_and_public_policies.pdf
- https://cdn.shopify.com/s/files/1/0434/7310/9152/files/put_android_apps_on_iphone.pdf
- https://cdn.shopify.com/s/files/1/0431/8196/5461/files/81912149454.pdf
- https://cdn.shopify.com/s/files/1/0432/7496/1059/files/mean_arterial_blood_pressure.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34456372212.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_off00006119.bin` `dc27c1408a66c1c2c9ada74c77d5b58e09ec836f04fc10d51800ef8da8f6a9d9`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6119	4172 bytes
`font_01_sfnt_off00006fdc.bin` `cddcb2168b982f16b6845cc9cf0d5eb0a510bf3c3de52ebc92d8d3ff1452d400`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6FDC	5300 bytes
`font_02_sfnt_off000081fd.bin` `3372d0419a7c54f5b4f1b9f2d2fa47f0f492b4d555fef2fe986bd828ac8fe408`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x81FD	10088 bytes

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