PDF malware analysis — malicious · bfde7ebdf6149a10

MALICIOUS

PDF

38.8 KB Created: 2020-08-29 05:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: ed14581f384881d3d6af721f9d53788a SHA-1: 73cb7b139bfb69f79ffa2dc7cb8952b052a03ec8 SHA-256: bfde7ebdf6149a109aae519e6de7d7054797c544d113b70b52363aa635c4f477

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. This, combined with the 'PDF_SEO_LINK_FARM' heuristic, suggests the document is part of a campaign to lure users to malicious sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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=fundamentals+of+business+mathematics
- https://static.usrfiles.com/ugd/b8c837_d82ddba4bf73414389264b9225794724.pdf
- https://static.usrfiles.com/ugd/b8c837_9722476c563b4898b0941ec6fe867a79.pdf
- https://static.usrfiles.com/ugd/b8c837_f1c22cce53d44ffab0fb13b1d5cecbab.pdf
- https://static.usrfiles.com/ugd/b8c837_79f7511c81a6460597ceabda20b33dc2.pdf
- https://static.usrfiles.com/ugd/b8c837_61aa954e9a2c416e8cf530f4bbf5c2ce.pdf
- https://cdn.shopify.com/s/files/1/0436/2846/2243/files/see_if_someone_blocked_you_on_discord.pdf
- https://cdn.shopify.com/s/files/1/0437/5917/3790/files/payment_summary_annual_report_due_date_2018.pdf
- https://cdn.shopify.com/s/files/1/0434/3290/2806/files/401k_guidelines_2018.pdf
- https://static.usrfiles.com/ugd/b8c837_b4904fb0ba084e1d9d91f1739727aeed.pdf
- https://static.usrfiles.com/ugd/b8c837_daf4ec05f5bf402faf6d38e30f2777ea.pdf
- https://static.usrfiles.com/ugd/b8c837_c5457d31b2ec4059a31b98aa8781f0d3.pdf
- https://cdn.shopify.com/s/files/1/0433/4885/2894/files/53061927447.pdf
- https://cdn.shopify.com/s/files/1/0452/1564/5856/files/91969018245.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_off00005a01.bin` `c2323a61e85345d4ecf9f0f77f031a3c7e34f06967bc11249f857a3066de980f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5A01	5260 bytes
`font_01_sfnt_off00006bc1.bin` `6698b70ea649381a6015e099d9c05c059dc1e1559af1bc505a39a349a67d041c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6BC1	10112 bytes

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