PDF malware analysis — malicious · 226acaff6d2efb27

MALICIOUS

PDF

42.2 KB Created: 2020-08-30 18:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f1d14cae21f3eaf38b53eb65b769798e SHA-1: 6c9dc2c99dde82abf4e8d98ca24db34486a57fac SHA-256: 226acaff6d2efb27f8156ae914d4c247c0fa77a3cf692e743a01bc21423da24b

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of the malicious redirector URL and the sheer volume of external PDF links suggest an attempt to lure users to malicious sites or engage in SEO spam.

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.ru/wix?keyword=brooks+brothers+size+guide
- https://cdn.shopify.com/s/files/1/0427/7587/1654/files/runescape_mage_equipment_guide.pdf
- https://cdn.shopify.com/s/files/1/0433/8538/9221/files/62885515194.pdf
- https://cdn.shopify.com/s/files/1/0432/0660/7012/files/29057211786.pdf
- https://static.usrfiles.com/ugd/b8c837_8d791ac1433d47b5ae15dd4042e1d47c.pdf
- https://static.usrfiles.com/ugd/b8c837_d5334062b76041b4906fa610bd60d58a.pdf
- https://static.usrfiles.com/ugd/b8c837_9e1c665a6c0f4ef59084568526fe18b9.pdf
- https://static.usrfiles.com/ugd/b8c837_6b1e24127d5c4175b889c175a960c520.pdf
- https://static.usrfiles.com/ugd/2e4eb4_25c097dca04e447787efcae038fef8b0.pdf
- https://static.usrfiles.com/ugd/b8c837_b1af31325dd04060929ca47486efe374.pdf
- https://static.usrfiles.com/ugd/b8c837_0202632f4e124db693db91f62f856c52.pdf
- https://cdn.shopify.com/s/files/1/0431/4651/0497/files/gapanisuweropubasiparogev.pdf
- https://cdn.shopify.com/s/files/1/0466/2856/9253/files/mopifaxekojiroro.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_off00005bbb.bin` `82a4b233060590098832706db7518e4db07561f9800dac6f16f7af98eb144357`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5BBB	5148 bytes
`font_01_sfnt_off00006d40.bin` `8178453963886509c07f2debebf32c55ca728e4803f0d423251399a90a3c91d2`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6D40	14428 bytes

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