PDF malware analysis — malicious · 267fbfdc2e4583f8

MALICIOUS

PDF

33.9 KB Created: 2020-08-31 17:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: ed9ad578b26d9f5d4c572f68ad9931db SHA-1: 4ed15a0ea8c663d198de0a910e0aee0c4805fb9f SHA-256: 267fbfdc2e4583f896dea582fbcba0bfb77c7000a9de4eaf699aff97c051ab5c

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with the primary URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is an answer key, which is a common lure. The ML classifier strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which likely leads to further stages of attack.

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=english+file+intermediate+third+edition+answer+key
- https://static.usrfiles.com/ugd/39d081_f6dcffd514034b2db43599330588de5c.pdf
- https://static.usrfiles.com/ugd/1ee69b_f7e1d172e0d8441abbc19107c39f5114.pdf
- https://static.usrfiles.com/ugd/b8c837_41c9f0d5e1cc4f4baa542f3dbb10501a.pdf
- https://static.usrfiles.com/ugd/b8c837_6464dbe169cc49d0aa374dad3f2ae1e4.pdf
- https://static.usrfiles.com/ugd/5ecadc_20a9be9ecb6b48928f578e418f8eb23f.pdf
- https://static.usrfiles.com/ugd/3b7182_e4373625f8644dc1a37541d0a5fa94c2.pdf
- https://static.usrfiles.com/ugd/defcb2_74ca1a57b54645b3af0bec7d4511736b.pdf
- https://static.usrfiles.com/ugd/b8c837_356b15b450b24591b0eb03bcefb11b74.pdf
- https://static.usrfiles.com/ugd/b8c837_81b48788db024d088584af02255238f5.pdf
- https://static.usrfiles.com/ugd/b8c837_2968bec767fc414990ff7115e05a105f.pdf
- https://cdn.shopify.com/s/files/1/0427/6640/1692/files/dojas.pdf
- https://cdn.shopify.com/s/files/1/0433/8712/5927/files/kesaneped.pdf
- https://cdn.shopify.com/s/files/1/0435/4654/2229/files/arduino_uno_starter_kit_tutorial.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_off000044ba.bin` `d76c82ffaa1ca58bfac3c328f58f77aae7869904c2e8ae0d7bf1f348ad2f813e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x44BA	5536 bytes
`font_01_sfnt_off00005781.bin` `ff0ca1b52a62ef181d3f014f971dd7f7ad706d3692e69ffe3deb7fe0c3c1a4b2`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5781	10212 bytes

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