PDF malware analysis — malicious · 73fde38a8c692765

MALICIOUS

PDF

35.5 KB Created: 2020-09-05 23:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 6a15fb3ac0bfa673930d60ccb7536a3c SHA-1: 2cc83e5fd3b26560eaa784974ae8013b01a03e54 SHA-256: 73fde38a8c692765a5fdc98cf79ce7555d4ffbd240a64c2a0eaa64657b861757

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains a link to a redirector URL, which is a common tactic for phishing and SEO spam campaigns. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of numerous links to external PDFs suggest this file is part of a link farm designed to drive traffic to malicious or spammy content. The ML classifier also strongly indicated maliciousness.

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.link/pify?keyword=hp+elitedesk+800+g4+workstation+edition+datasheet
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/ef7b09_e258a83760ed493a9b54c6c855fc3229.pdf
- https://static.usrfiles.com/ugd/3283b0_d6897c758b9444a2a2408c78a574a56b.pdf
- https://static.usrfiles.com/ugd/275374_2e026e8bd954405bbcb1824afe7e9bb4.pdf
- https://static.usrfiles.com/ugd/6260fe_47c9f0e092cb48a8b6c2af1915438ff4.pdf
- https://static.usrfiles.com/ugd/299074_8aeccbd1c88e45859777bf05b777f78c.pdf
- https://static.usrfiles.com/ugd/b4609a_805c973db9da4365951d2b76e1c89c10.pdf
- https://static.usrfiles.com/ugd/3402b1_9f20193d493045378b8217809c56e676.pdf
- https://static.usrfiles.com/ugd/3ceeb9_92f26a5f6fce4014acdc01af1b7471fa.pdf
- https://static.usrfiles.com/ugd/b7ab08_b5dce6314fd8433d968873e406cc84c1.pdf
- https://static.usrfiles.com/ugd/31593d_9374c72e21734446906e38c26119b244.pdf
- https://static.usrfiles.com/ugd/b8c837_d444418520d14a84a5d78672c35875bc.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_off000049bf.bin` `2001d6238dc209e232c23e0899598d2de1573600cdf8cd78539e529523351930`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x49BF	5760 bytes
`font_01_sfnt_off00005d6e.bin` `2d306a82b7e1798b5a5c26d257d9d3ddd16b5498d58136306f0ab03e5466e535`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5D6E	10472 bytes

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