PDF malware analysis — malicious · c430b58e0227d353

MALICIOUS

PDF

41.5 KB Created: 2020-09-12 03:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 16664c46e72857738e550b85d32853e3 SHA-1: 4bc839c302acd91258d684751ffe05466e35d4b3 SHA-256: c430b58e0227d353f3c7e348ae44edcf53f7b496437251007cc3d34b905e6320

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The document body text is largely unreadable binary data, but the presence of the malicious redirector URL and the heuristic firings for PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly indicate a malicious intent to lure users to harmful sites. The ML classifier also flagged this PDF with high confidence.

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/wix?keyword=only+banjo+music
- https://static.usrfiles.com/ugd/b8c837_563bce6c44624919b8f09561690b991b.pdf
- https://static.usrfiles.com/ugd/1acd69_eb50d034bd4047588dd9bcfb997df33b.pdf
- https://static.usrfiles.com/ugd/ccb1c6_49fbb0f659a44ceea7253fe6ba21d4e8.pdf
- https://static.usrfiles.com/ugd/e5cbe5_f0dec3b408ed42289186634753289468.pdf
- https://static.usrfiles.com/ugd/e745be_0dad596fd2264d139ba9a905eda48183.pdf
- https://static.usrfiles.com/ugd/eaf48f_c2f20637c7b44179b5a70e417c26da83.pdf
- https://static.usrfiles.com/ugd/f7fbc8_0026f646cbc148aaa7f4c49f079430e0.pdf
- https://cdn.shopify.com/s/files/1/0435/5896/1320/files/46479506464.pdf
- https://cdn.shopify.com/s/files/1/0430/9434/3841/files/pdf_to_dwg_converter_online_without_watermark.pdf
- https://cdn.shopify.com/s/files/1/0433/1195/6126/files/pulesimeguvavifedofi.pdf
- https://cdn.shopify.com/s/files/1/0451/4365/4565/files/polycab_lv_cable_catalogue.pdf
- https://cdn.shopify.com/s/files/1/0462/2896/3482/files/71718761134.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_off000065d5.bin` `5833e93cb3b8ce3ee8e19102145bae8e23b66dd2c07043ebd9d405ffe7322c4c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x65D5	5196 bytes
`font_01_sfnt_off00007776.bin` `2b805e0bc28274d464aaccfd81063fd6fbb37303dd56e4dbbd61748ea0a14135`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7776	10076 bytes

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