PDF malware analysis — malicious · 10ac9770491c5743

MALICIOUS

PDF

38.6 KB Created: 2020-09-01 08:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 94bff4595cde6ee261983a3ffd944b72 SHA-1: 0cc0db956bd10eb61b99f49ea6724e1e4f33ca18 SHA-256: 10ac9770491c57431a0a61b52338b0e252907d8ac711c4ac832f136c85ce2a6b

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which, 'https://ttraff.cc/wix?keyword=numl+application+form+2019', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure the user to a malicious site under the guise of an application form. The presence of numerous other PDF links, some pointing to external files, further supports a link farm or redirection strategy.

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.cc/wix?keyword=numl+application+form+2019
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/ae059d_bb1c05a7e8a745898cab1e367c60fb92.pdf
- https://static.usrfiles.com/ugd/c068f8_ce18fcaf7e914040bada831a9e485fc7.pdf
- https://static.usrfiles.com/ugd/b8c837_9a3b37f170d244a4b7b7ee49d1f1d659.pdf
- https://static.usrfiles.com/ugd/724fb5_f8cf77bede314272a99fc79b2fbe9237.pdf
- https://static.usrfiles.com/ugd/5be868_716cf522d82b4556a11475b81b9d97d4.pdf
- https://cdn.shopify.com/s/files/1/0432/9478/5694/files/learn_to_draw_for_beginners.pdf
- https://cdn.shopify.com/s/files/1/0428/8207/2732/files/gofedamobogep.pdf
- https://static.usrfiles.com/ugd/e5a943_e8161844327645e190612efda6c44a71.pdf
- https://static.usrfiles.com/ugd/b8c837_962fd79bb9d446a69a58baa2356dbaa9.pdf
- https://static.usrfiles.com/ugd/b8c837_c156cb0b3be843ce97a3e570bb728c2c.pdf
- https://static.usrfiles.com/ugd/d5415a_226510287e99419fa9354eaae48530e6.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/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000058ac.bin` `9664329fcd70eee095b4c13e889c43d1e0edbd7a82bce35402969417357cb583`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x58AC	5432 bytes
`font_01_sfnt_off00006b1e.bin` `efb7d117ba91b87f06f735fb08db8aed4e6e9eba87f69dd73068de0be46a022b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6B1E	10244 bytes

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