PDF malware analysis — malicious · 3d30264623eaf1e7

MALICIOUS

PDF

57.9 KB Created: 2020-08-31 11:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 1dcd5955cfbaa8339b1c5509c6ed858f SHA-1: 972e8c51d9b3bd701fc0ce0664e33e858b07ca3d SHA-256: 3d30264623eaf1e76f7d8398d8ad96dab91ac8d1128d78c4aeaa5908e3ac8232

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged as malicious due to a critical heuristic firing for a redirector link pointing to known malicious infrastructure. The document body contains the same URL, suggesting it's the primary lure. The presence of numerous other PDF links, many hosted on static.usrfiles.com, indicates a link farm strategy. 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.cc/wix?keyword=terraria+skeletron+prime+guide
- https://cdn.shopify.com/s/files/1/0432/1175/1588/files/42769849188.pdf
- https://cdn.shopify.com/s/files/1/0432/1512/6685/files/creating_a_vector_in_c.pdf
- https://cdn.shopify.com/s/files/1/0433/0645/1094/files/diccionario_biblico_descargar.pdf
- https://static.usrfiles.com/ugd/8c0e65_9b2a6f1327c74ab5b25b7c898fee0ac2.pdf
- https://static.usrfiles.com/ugd/0bcf16_1f0c203702e045b3a4e901cecac9295f.pdf
- https://static.usrfiles.com/ugd/b8c837_2d69e7d67fab432a97d0fad4414a40cc.pdf
- https://static.usrfiles.com/ugd/e33828_8b281182d8994eceaa593ec2a3f2e008.pdf
- https://static.usrfiles.com/ugd/a48928_ad2e6d181e7a4d6e8bb069189bad3564.pdf
- https://static.usrfiles.com/ugd/b8c837_0a9c41132ada4ed8a25eb7fa1c4e5b61.pdf
- https://static.usrfiles.com/ugd/b8c837_f4169acc233d41eaab9309ee208495ae.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/
- https://static.usrfiles.com/ugd/

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00009092.bin` `3077da4a96023d95523ad2ca23843ff5b266eb4c5c574ecec53d8f664f145385`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9092	5292 bytes
`font_01_sfnt_off0000a276.bin` `a5ba3bf50496e0515584dff2ca4b9a79a340b2dea42035961dc1c6770811c220`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA276	10352 bytes
`font_02_sfnt_off0000c606.bin` `35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC606	16036 bytes

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