PDF malware analysis — malicious · b8432c79811a59d3

MALICIOUS

PDF

53.5 KB Created: 2020-08-31 13:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: b76e83c8007b37f63fa28c5d226a630a SHA-1: b6e225241cb38320dfca0ff65871e10f56138e73 SHA-256: b8432c79811a59d3dfea5c4dd9d6a4b12ce895375f888d0694dbc6237c930185

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/wix?keyword=sharp+aquos+crystal+306sh+firmware'. This URL is embedded within the document body, suggesting a lure to trick the user into visiting a malicious site. The presence of a large number of external PDF links, many pointing to static.usrfiles.com, indicates a potential SEO poisoning or link farm tactic to increase visibility and traffic to malicious content. No scripts were extracted from this sample.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 3

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.
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=sharp+aquos+crystal+306sh+firmware
- https://static.usrfiles.com/ugd/b8c837_bf85d2d082af469d8735312db3fb9416.pdf
- https://static.usrfiles.com/ugd/b8c837_3c3186151282412994eede7da5cfc590.pdf
- https://static.usrfiles.com/ugd/b8c837_196c6694c5074fdab78e83b1d9110e4f.pdf
- https://static.usrfiles.com/ugd/b8c837_58fdfc4a8f1b44278fbdad7c90667232.pdf
- https://static.usrfiles.com/ugd/625844_eeff66b13e2941649f59fc911827b112.pdf
- https://static.usrfiles.com/ugd/8b49c6_b43455c44b354e6ebee2b32860b29142.pdf
- https://static.usrfiles.com/ugd/685707_a89faa8561f8442588d7c4c228a25767.pdf
- https://static.usrfiles.com/ugd/6a7407_06414e1bbc114a45b2730221be2b0051.pdf
- https://static.usrfiles.com/ugd/b8c837_19d6b2351b174b71a02d7582669cccff.pdf
- https://static.usrfiles.com/ugd/b8c837_ed7e2a5b55a14f97b0ce5307ea5f285c.pdf
- https://static.usrfiles.com/ugd/b8c837_9a0d2140dc5c485c8c0658163308a9da.pdf
- https://static.usrfiles.com/ugd/de65f7_9c989c9740334fcfafc54215db4a60de.pdf
- https://static.usrfiles.com/ugd/3f4b99_0a8657ca4fe64913a6670585a3a4544f.pdf
- https://static.usrfiles.com/ugd/b8c837_36b94304d93f40bca7dbe41b437efeb7.pdf
- https://static.usrfiles.com/ugd/b8c837_21106e17e4e34c569abac13d06c60374.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_off00008367.bin` `eccb3999096c204df20ae8b7ed08a6784256b4826db4d701daf9f658af080773`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8367	5912 bytes
`font_01_sfnt_off0000979d.bin` `bcf942e896edb32cb3a28fcc3497a1a28448bcb8824b8637334305087b3cd149`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x979D	10260 bytes
`font_02_sfnt_off0000ba98.bin` `a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBA98	4324 bytes

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