PDF malware analysis — malicious · 8e26dd5dd62c963e

MALICIOUS

PDF

44.7 KB Created: 2020-09-03 03:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: fd2184a049f41ef22be25896eb7576ae SHA-1: 0eb445babac17e9b23d3781b97a4b0e5a1b53099 SHA-256: 8e26dd5dd62c963e3545603f7e8f73f532eaf6091f150b2131996d0dc1564767

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document was flagged as malicious by an ML classifier and contains a large number of embedded links, with at least one pointing to a known malicious redirector. The document body is heavily obfuscated, but the presence of numerous links suggests a link farm or phishing attempt. The primary attack pattern involves luring users to external malicious sites via embedded links.

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=predicate+nominative+and+predicate+adjective+worksheets
- https://static.usrfiles.com/ugd/a2e20a_c68646ff8d234beba0bf54f1d4b682e9.pdf
- https://static.usrfiles.com/ugd/4d400c_ad981dcfc6c1429ba69f60f9f382d853.pdf
- https://static.usrfiles.com/ugd/26481d_1ccc69a274ef439f827e3efa87be255a.pdf
- https://cdn.shopify.com/s/files/1/0433/5819/1768/files/lisajipiniwazax.pdf
- https://cdn.shopify.com/s/files/1/0440/7967/7590/files/ruwipipiwulizug.pdf
- https://cdn.shopify.com/s/files/1/0431/4021/9037/files/megizawuwazokulixaraz.pdf
- https://static.usrfiles.com/ugd/ef253e_d006ead5595346a0bd99631016d41afc.pdf
- https://static.usrfiles.com/ugd/0bfb20_c69918272dc147aa9c861eb600af693e.pdf
- https://static.usrfiles.com/ugd/85d67f_19019e0d05484dc681b01aadf9b6ce10.pdf
- https://static.usrfiles.com/ugd/b8c837_d1f77c90893a4412aaa3473ad3b14f38.pdf
- https://static.usrfiles.com/ugd/d1d005_5218615d7ce2499c92bd156000f4362f.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000624d.bin` `7dfdbf9d9f0ce7b476f04e5bf20b8fc89755f92e6ec979af49a8dda31e34ceef`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x624D	5364 bytes
`font_01_sfnt_off00007462.bin` `c36b0b9e6cb50028417653125a6dcc5da435518f6306dc07154f272b755f5261`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7462	10288 bytes
`font_02_sfnt_off0000978f.bin` `0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x978F	4324 bytes

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