PDF malware analysis — malicious · d6128dd8e639e953

MALICIOUS

PDF

36.7 KB Created: 2020-09-05 21:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 35c410c26166746483913e445804f3fd SHA-1: 85cb84abceee81f18df279de0ed5dfaa2ee168ea SHA-256: d6128dd8e639e95347875d03db046b7e18880216ecf5150e94c72d735186d3c9

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a lure related to 'mental maths year 6 answers' and embeds a link to a known malicious redirector. The heuristic firings confirm the presence of a malicious redirector link and a link farm, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=targeting+mental+maths+year+6+answers
- https://static.usrfiles.com/ugd/c83fdb_efb2362d47be4144a4f6ccdff1981110.pdf
- https://static.usrfiles.com/ugd/008e52_6345047964ff4a478b795a6516156607.pdf
- https://static.usrfiles.com/ugd/a48928_8df8f59103a34af181d0eb720bfca523.pdf
- https://static.usrfiles.com/ugd/39cb9d_f4f0bca679d14b9ab0c202c9a18fe3b3.pdf
- https://static.usrfiles.com/ugd/485053_7ce36f8d60204487b77b1248ce859c7d.pdf
- https://static.usrfiles.com/ugd/88a84f_db3a15050dc641f58252174f84a53035.pdf
- https://static.usrfiles.com/ugd/95bb70_9797d8a3607942f9a665df2551d17210.pdf
- https://static.usrfiles.com/ugd/7182f3_1dd30855ba5246f5905d9e25c90ce2af.pdf
- https://cdn.shopify.com/s/files/1/0432/2285/9944/files/49456971108.pdf
- https://cdn.shopify.com/s/files/1/0432/8184/2332/files/jatusizo.pdf
- https://cdn.shopify.com/s/files/1/0433/7205/2643/files/4854803309.pdf
- https://cdn.shopify.com/s/files/1/0466/8925/5588/files/delete_worksheet_in_excel_using_c.pdf
- https://cdn.shopify.com/s/files/1/0433/1238/2117/files/kaxakufonibepad.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_off00005204.bin` `d2594e77c1e97191720c2323f49cdecac06304c456758243d052068f4d73353e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5204	5396 bytes
`font_01_sfnt_off00006446.bin` `c79ce74a3d1c9aa363957bf277d4d319fdf3773f92627586ef998df750e23b89`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6446	9896 bytes

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