PDF malware analysis — malicious · f139001c7d9d6f82

MALICIOUS

PDF

46.3 KB Created: 2020-09-01 00:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 277da0147f1da1ab78e1232be9937729 SHA-1: da84019709d8b6e6f55a15a9fb0446759498c200 SHA-256: f139001c7d9d6f8296b3237486375571d85d08c5c954a63042d5e41ed8473e48

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The embedded URL points to a known malicious redirector, and the document body, though heavily obfuscated, contains this URL and other links to external PDFs. This suggests the primary purpose is to lure users to malicious sites.

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.ru/pify?keyword=alpujarras+tourist+information
- https://static.usrfiles.com/ugd/b8c837_c5696e3f709347e98e4e32ffb672a74c.pdf
- https://static.usrfiles.com/ugd/ae059d_0265ceb658124ed285162366ff0e18de.pdf
- https://static.usrfiles.com/ugd/b8c837_4493b3712e744fbdae29f68889328556.pdf
- https://static.usrfiles.com/ugd/b8c837_c3df21f3f5054bd4a00a04d57a071cc7.pdf
- https://cdn.shopify.com/s/files/1/0431/2222/9397/files/pavutozarufojapoxatif.pdf
- https://static.usrfiles.com/ugd/ce5d00_188103d48c154858a555946a1d2d2c24.pdf
- https://static.usrfiles.com/ugd/1cc7e8_be67251fb97340178d7940a15dbe3330.pdf
- https://static.usrfiles.com/ugd/b8c837_c5e2d96e8b664eca90f671195c5a7cb4.pdf
- https://static.usrfiles.com/ugd/b8c837_dd3f338279524cbdb4d0238203f1e331.pdf
- https://static.usrfiles.com/ugd/b8c837_b3c91d1cdd20489fab72408da3a639f5.pdf
- https://cdn.shopify.com/s/files/1/0434/0056/0805/files/wamefofikurisom.pdf
- https://cdn.shopify.com/s/files/1/0440/9029/4437/files/pabupisowaf.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_off0000618b.bin` `a6446e0c179f25536c4a591bf3486515b8baec72a6ccfb24f9db3a63756c56c7`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x618B	5112 bytes
`font_01_sfnt_off000072df.bin` `9671d8ba9e491ad9bcdba781884c0be9db788bf77fbd4e729b8606521bf9f786`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x72DF	9956 bytes
`font_02_sfnt_off00009535.bin` `06a150c540cc158a879ebcf97acf6805b3ee2f39ca1847770506918718272958`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9535	16728 bytes

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