PDF malware analysis — malicious · f9afc489c71c4989

MALICIOUS

PDF

68.1 KB Created: 2020-09-06 22:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: e4bb520bc5dfc3bd80e47ddc752b8814 SHA-1: 1cd443a9c08f1a88b825bed197e80c79a5b5e902 SHA-256: f9afc489c71c4989d2ccd069dad21a5124dba59ce2264d58081167868424fb98

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.me/wix?keyword=craniofacial+anomalies+pdf'. This URL is presented within the document body, disguised as a link to a PDF about craniofacial anomalies. The ML classifier also strongly flagged this PDF as malicious. The document's purpose appears to be to trick users into visiting the malicious URL.

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=craniofacial+anomalies+pdf
- https://static.usrfiles.com/ugd/4d400c_28baa1e2ed0246dbb34e79f3e86ac0e6.pdf
- https://static.usrfiles.com/ugd/b8c837_1cd0c15b13944d3c8c0a7ccd19bb429c.pdf
- https://static.usrfiles.com/ugd/9c43ec_339edd6ebcd54a128659918e37c9cbf6.pdf
- https://static.usrfiles.com/ugd/c068f8_6a7400a06c7c42e987f71a6d1b409fc8.pdf
- https://static.usrfiles.com/ugd/3826db_887e82f7e3434799aa48333bec6ee4d0.pdf
- https://static.usrfiles.com/ugd/a4e402_442cde39001344f9a32dfe711969afc4.pdf
- https://static.usrfiles.com/ugd/dcc11b_cee601205af64fa6a4acaa4e65697d38.pdf
- https://static.usrfiles.com/ugd/6290de_ee7066cd9a92426f8aaa8897caacf87f.pdf
- https://static.usrfiles.com/ugd/544e7e_f5ab4257bbd84ffcb2dec1adbd9ee3d0.pdf
- https://static.usrfiles.com/ugd/d4da64_8b58cfcd8afe43e9b6657a920c7933be.pdf
- https://static.usrfiles.com/ugd/417718_9ea20bc1d687486c92a8c66c85722bd9.pdf
- https://static.usrfiles.com/ugd/2486b5_1ba684508f1f4a35bc53baa6c16dd618.pdf
- https://static.usrfiles.com/ugd/ae059d_70e87d3fa36d45378cdf863f9a4ec1b3.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_off0000ce46.bin` `9752996ae5a7241d64a243ecdde3cbff41e39ec0d0d67910093995da31bbf7a8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCE46	5208 bytes
`font_01_sfnt_off0000dfe1.bin` `32f39ac8b8832d064ea0fbb86916da9262e4084d1271a23661976a2516e384f5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFE1	10376 bytes

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