PDF malware analysis — malicious · 99dd2a0ea69d03d3

MALICIOUS

PDF

43.9 KB Created: 2020-09-01 13:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: b7e54c58d0f2389f925fb33e0273fe65 SHA-1: abe5af7302263a7bda0e7b8d3410e42b5088721d SHA-256: 99dd2a0ea69d03d3164b162094938ae98f0b0fe24e52c59b6e7816651e64e22e

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged for containing a malicious redirector link and a large number of external PDF links, indicating a link farm. The primary malicious URL, https://ttraff.cc/wix?keyword=crewel+embroidery+stitch+guide, is likely used to funnel users to malicious content. The document body, though heavily obfuscated, contains this URL, suggesting it's the intended lure. The presence of numerous benign-looking PDFs hosted on static.usrfiles.com suggests a tactic to mask the malicious redirector.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 3

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.
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=crewel+embroidery+stitch+guide
- https://static.usrfil
- https://static.usrfiles.com/ugd/c63dba_9243b6dac7804392880ec3466cb69c98.pdf
- https://static.usrfiles.com/ugd/4e6dd5_70c97aa730da42a5843fba60e06f158b.pdf
- https://static.usrfiles.com/ugd/b8c837_72114670a1974d5293f12dccec51f90e.pdf
- https://static.usrfiles.com/ugd/b8c837_a2fc3fdd1b7b45ecac6f7c150c6a00a4.pdf
- https://static.usrfiles.com/ugd/b13fd1_4e7e2ddc7f1d4fab9edb36113e8d7240.pdf
- https://static.usrfiles.com/ugd/6f7357_2d28aad58ca94db4971792edb0d1f3b5.pdf
- https://static.usrfiles.com/ugd/26481d_1ee7e39f48f24d4ab736b09a1ce54da4.pdf
- https://static.usrfiles.com/ugd/b8c837_83b9462286874da28ee99fd604e281d4.pdf
- https://static.usrfiles.com/ugd/de65f7_5c1e20af2db74b87b6e5a8d5bc10447d.pdf
- https://static.usrfiles.com/ugd/b8c837_8e9cc5ab94c448da854a1bd4eeb2081d.pdf
- https://static.usrfiles.com/ugd/48d9a1_55c1361c32ce463d8cf5ea0a5398d153.pdf
- https://static.usrfiles.com/ugd/7ea8bb_2b3081c114544a23aff6d5f4fcd80e10.pdf
- https://static.usrfiles.com/ugd/cc089a_a7e7bfc620d74b20863bd68451ed1ed6.pdf
- https://static.usrfiles.com/ugd/4b68be_6aa177b6488f46aaaad85cd554dc7056.pdf
- https://static.usrfiles.com/ugd/69b86f_677bb9b44643494388a96bae06816603.pdf
- https://static.usrfiles.com/ugd/b8c837_96fd505f73ce4c528ffd0cc23ef824c5.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_off00006701.bin` `7bdc4459d71cca715e880b74dbc8bf17fedf859cf0e0f85351c23c3f0d58a7ca`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6701	5384 bytes
`font_01_sfnt_off00007937.bin` `3cf1c567a9d9949fb230fa79a9507a7d7534a2ecc5e7c3e2b93788f85372a4f3`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7937	12868 bytes

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