PDF malware analysis — malicious · 38d397be444f481f

MALICIOUS

PDF

41.8 KB Created: 2020-08-30 14:40:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: ed07c3972159f8619da7303b6e3b4083 SHA-1: 1b4448da4e80717f2ef09884df3d948ec86ecb15 SHA-256: 38d397be444f481f9dea2b52ef3f97870801d87ed045ea10d034d1a8d4778399

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a search result for "dungeons and dragons 5e pdfs". The document body and embedded URLs indicate a lure to a malicious website. The ML classifier strongly flagged this PDF as malicious, and multiple heuristics confirm the presence of malicious redirector links and a link farm.

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.com/wix?keyword=dungeons+and+dragons+5e+pdfs
- https://static.usrfiles.com/ugd/b8c837_5f2b8e7dab6147c78548b4e5b26f0096.pdf
- https://static.usrfiles.com/ugd/d17951_ec595cbe8ec946c5b08728a695e7cba3.pdf
- https://static.usrfiles.com/ugd/b8c837_dc3bc6cf448b46d28de180040076090d.pdf
- https://static.usrfiles.com/ugd/b8c837_d25d82c8fd9f4ffeb8bf7ae5e9b12481.pdf
- https://static.usrfiles.com/ugd/de3d83_93137b0231c44127ac97b98953e63d8f.pdf
- https://static.usrfiles.com/ugd/b8c837_a0810512acd148e5aa12591355ce86ba.pdf
- https://static.usrfiles.com/ugd/c068f8_4f3347deb50f493fbdc3b428fc8e31b8.pdf
- https://cdn.shopify.com/s/files/1/0438/1917/2000/files/funizifegus.pdf
- https://cdn.shopify.com/s/files/1/0431/8570/1025/files/funes_dos_anticorpos.pdf
- https://cdn.shopify.com/s/files/1/0428/5523/5740/files/bed_psychology_books_in_telugu_free_download.pdf
- https://static.usrfiles.com/ugd/b8c837_ed2bcaf1ba7d400998efd749d792b133.pdf
- https://static.usrfiles.com/ugd/b8c837_b0045a5acf644ecd8e81c7dd61163492.pdf
- https://static.usrfiles.com/ugd/b8c837_b795ef5f06474cda8c10d76bfa098e23.pdf
- https://static.usrfiles.com/ugd/4d6844_fa18451457d34de58c5b5c8b40a42492.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_off000064b1.bin` `5f3d63234001d4b6392b5e5f7e52131cb4e1fda47daf5879afb665de62c0bc4d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x64B1	5300 bytes
`font_01_sfnt_off000076cf.bin` `47108607c17fd7ecba5a7d33c50a23c6975440ef67879cf90eeda9c1cf903e0c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x76CF	10524 bytes

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