PDF malware analysis — malicious · 50fd05b0370c6e83

MALICIOUS

PDF

33.9 KB Created: 2020-09-08 22:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: eca27e8d7647fbf5312679b2ea256e30 SHA-1: f92bb86ce60cf9b8f9551945668d40ebc74d1ef4 SHA-256: 50fd05b0370c6e837c0c4093a039dc7127e7feedc39391ad79211aa97f9b1907

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, including a redirector to a malicious domain, disguised as wallpaper content. The ML classifier strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely leads to a second-stage payload. The document body text and embedded URLs confirm the lure.

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=hd+cartoon+couple+wallpaper
- https://static.usrfiles.com/ugd/912de2_4ba522bbf2fd4b8bbb0690924b82b0b9.pdf
- https://static.usrfiles.com/ugd/89363e_17ab4e6848824a83ade54ca949d5b443.pdf
- https://static.usrfiles.com/ugd/9eb187_a72cef9bbc6f4c37a8abcdc0e85c7c17.pdf
- https://static.usrfiles.com/ugd/2e4eb4_b57899e7b84e45fab355677b8aad42d2.pdf
- https://static.usrfiles.com/ugd/696117_9733dd8e833549709eb31f7e853aeb88.pdf
- https://static.usrfiles.com/ugd/9df9d6_65e8f3625d5d42d0b5c16c9e1bdf8312.pdf
- https://static.usrfiles.com/ugd/a44510_2caa5882b8f942828067ff07368e9e7a.pdf
- https://static.usrfiles.com/ugd/b8c837_14bc6957236c4121b92d4b9c3224770d.pdf
- https://static.usrfiles.com/ugd/277b62_da09f8f827454fce9ec929daef7ab7ba.pdf
- https://static.usrfiles.com/ugd/b910ae_25a8042e1b814b37a1494a1b142dd1e8.pdf
- https://static.usrfiles.com/ugd/d55797_4bc960c5d08e408595ec85cf2264bd4b.pdf
- https://static.usrfiles.com/ugd/b8c837_a5d220dd90284c729c86f96fde353a67.pdf
- https://static.usrfiles.com/ugd/278743_9f3f7e5ef5b7488eb97f87ba27f7a43d.pdf
- https://static.usrfiles.com/ugd/f09a9d_fc7dbcffe1d14b53899436cfd69e6c6f.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_off00004b0d.bin` `2033f3374f1931accb9d9c21c2f876e64bd332c8a064714ec3e463d5faa5458c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4B0D	4940 bytes
`font_01_sfnt_off00005bf2.bin` `1f60120387078a25f4cad40c61e786b3fd97021f461757461e76b4489749ad78`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5BF2	9156 bytes

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