PDF malware analysis — malicious · 16c34e8b714b4505

MALICIOUS

PDF

33.0 KB Created: 2020-09-10 03:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: cbfde5cefd67a78dbac7950dc0d10056 SHA-1: 46d090259fd418bd53f2f941453ec25f6bea6748 SHA-256: 16c34e8b714b4505c57ed872d22e5f83c16477f9adcdd7ed89d7deff81567cba

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a link farm infrastructure, with one primary URL identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the primary redirector URL, suggesting an attempt to lure users to malicious content.

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.club/wix?keyword=identifying+silent+letters+worksheets
- http://files.visualronin.com/uploads/1/3/1/4/131438819/8598117.pdf
- http://kimim.artbyronda.com/uploads/1/3/2/6/132682261/zepafebezilijeben.pdf
- http://tibepuru.ludworthandmellorwi.com/uploads/1/3/2/8/132814989/peluwaget.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/0b46e6_13a2757277da49ad81efef08554099b7.pdf
- https://static.usrfiles.com/ugd/cfbfd2_cb7481fc3b104667bd61eece784f1e40.pdf
- https://static.usrfiles.com/ugd/6290de_840d709e8a534fd79d85e8b612263881.pdf
- https://static.usrfiles.com/ugd/bf0735_46bad7ccbc5446639eac715e76800278.pdf
- https://cdn.shopify.com/s/files/1/0433/2853/6731/files/20113965453.pdf
- https://static.usrfiles.com/ugd/2f3216_9e2709e0594a4611bb8e1b980f303192.pdf
- https://static.usrfiles.com/ugd/576447_99f4d307577b42d487cd38d7e6d7fcd5.pdf
- https://static.usrfiles.com/ugd/e2c6c1_dee3528639a34a42be3768add4f5a01a.pdf
- https://static.usrfiles.com/ugd/b8c837_73d299d862fd4e2e9863d1280a5e008d.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_off00004422.bin` `b3d0712503a2fd4d8cb6a18bcaa3d948ff09ff25710a7d390da0cb5814173833`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4422	5156 bytes
`font_01_sfnt_off000055c2.bin` `254b43f984664c8629b8cd178a1b0c9683ba47ccce1b7da1878b00bffb62f85a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x55C2	9820 bytes

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