PDF malware analysis — malicious · 1e6f5a88402ff1d1

MALICIOUS

PDF

32.5 KB Created: 2020-08-31 03:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: dfd2dbb637d688ca1ed9d9ffb783ce36 SHA-1: 255dd69c625fb6dbf5b972cce11e7e847122197f SHA-256: 1e6f5a88402ff1d1d86671c18729db93a2a696dcb7c1d3eafc0fb26a5f5fb9d8

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded links that are flagged as malicious redirectors. The document body, though heavily obfuscated, contains text referencing an 'Anbang insurance group annual report 2018' and a URL that appears to be a lure. The primary malicious URL identified is https://ttraff.ru/wix?keyword=anbang+insurance+group+annual+report+2018, which is likely used to redirect the user to a secondary malicious site. The presence of numerous other PDF links, many hosted on static.usrfiles.com, suggests 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.ru/wix?keyword=anbang+insurance+group+annual+report+2018
- https://static.usrfiles.com/ugd/0aab01_96271f9b95244f37819345039b8d63d8.pdf
- https://static.usrfiles.com/ugd/30e015_ddfac26b15104f6f95eb1bfd5d7760b1.pdf
- https://static.usrfiles.com/ugd/599026_0c85ee7f2f46450bb22bc5d0b5594b71.pdf
- https://static.usrfiles.com/ugd/cf14a4_76e9bd3faecc4a4f87567125d0b2b822.pdf
- https://static.usrfiles.com/ugd/b8c837_9e41fb55a0eb43d0b76671f3faa189dc.pdf
- https://static.usrfiles.com/ugd/0dcf4b_0ccc3623c4ee452fbf425b47703f7615.pdf
- https://static.usrfiles.com/ugd/cc14e4_4d054ce41f5e4b3a8eb364c790bf359d.pdf
- https://static.usrfiles.com/ugd/b8c837_896d32f8f627408d8385fc6365fe96c0.pdf
- https://static.usrfiles.com/ugd/48f461_bdc2cc5b64ab40a294181d9aaacfe513.pdf
- https://static.usrfiles.com/ugd/79cb75_5439f02d15c242e488d6c3edf6144b61.pdf
- https://static.usrfiles.com/ugd/b8c837_460d0313e2ff4da7bcfcd08254136c0b.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_off000041a9.bin` `6007b4da4a4d8d231a15626184c87107357478b44e81a6cd5350e1caee2aeea2`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x41A9	5752 bytes
`font_01_sfnt_off00005540.bin` `474a6dd32bed1c3ee8b4755b6beccf9a8bd67082f7b6c9f31e2c29156663c686`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5540	9404 bytes

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