PDF malware analysis — malicious · 539ac713c132c55c

MALICIOUS

PDF

41.2 KB Created: 2020-08-29 02:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: d242ea11cf84e20efbd7f884039c934a SHA-1: acb9f69c0608e2c8f082c3039ccc73d6c04e1371 SHA-256: 539ac713c132c55c183e485d4d0c733c4f60465aa0cb56f8164a7de61942206d

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1200 Hardware Add-in Systems T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com, and one critical link to ttraff.com which is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document's primary purpose is to redirect users to potentially harmful sites.

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=mark+of+shadow+elf
- https://static.usrfiles.com/ugd/b8c837_dc75acbff4444436856a2d8a458f12a5.pdf
- https://static.usrfiles.com/ugd/b8c837_3803c81a9ee94d22b9525ee52f038ba7.pdf
- https://static.usrfiles.com/ugd/b8c837_62694bd5de174a3cbe575983660a3ff1.pdf
- https://static.usrfiles.com/ugd/b8c837_8643c4b1f748493db9efe68227e26d45.pdf
- https://static.usrfiles.com/ugd/b8c837_2f46307689d54debacfec8c14670a98d.pdf
- https://static.usrfiles.com/ugd/b8c837_9b392e50b92442a1ba649909610dc163.pdf
- https://static.usrfiles.com/ugd/b8c837_52551db70c754f599b83e9b3a7d13f27.pdf
- https://static.usrfiles.com/ugd/b8c837_4f47f62f9f354b58b6213d2f9cf468d6.pdf
- https://static.usrfiles.com/ugd/b8c837_bcd35d9aec87446db8b0ef3bcbf7ace8.pdf
- https://cdn.shopify.com/s/files/1/0427/6482/8838/files/59628684030.pdf
- https://cdn.shopify.com/s/files/1/0433/5517/7109/files/4490677214.pdf
- https://static.usrfiles.com/ugd/b8c837_66ec3798ae87428899dc1dce723c1f64.pdf
- https://static.usrfiles.com/ugd/b8c837_3de7cee158594bb4a84d59cdef87c45d.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_off000063b6.bin` `bf15d9a3ec653f123c2690c5f20121d57d2fa7d2fdb91cf85ccce3de8ebf09a5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x63B6	5156 bytes
`font_01_sfnt_off00007550.bin` `7582ccca05816aa5bd5affa4bdf7fbfaaf8a8046694e8dfc5dba0bcc3b891f86`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7550	10276 bytes

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