PDF malware analysis — malicious · 8b729158dad6761d

MALICIOUS

PDF

32.5 KB Created: 2020-08-18 19:40:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 2bc0b62495cad69eb3bf066b982899c4 SHA-1: 5a95d875c1d3c9ac34d4635543fd17d4a6b5d35a SHA-256: 8b729158dad6761d88d2badd4403e4f81e8437f0bc4d95b72bf09d5be57394d7

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a malicious redirector link that leads to a link farm of other PDFs, likely as part of a SEO poisoning or traffic generation scheme. The document body itself contains the initial lure text and the malicious URL. The ML classifier strongly indicated maliciousness.

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/pify?keyword=blank+space+song+ringtone++zedge
- http://files.hossfeldbender.com/uploads/1/3/0/8/130815124/3060717.pdf
- https://cdn.shopify.com/s/files/1/0435/1341/3791/files/manual_batedeira_kitchenaid_artisan.pdf
- https://cdn.shopify.com/s/files/1/0434/2788/9302/files/jetoforemi.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rikujolam.pdf
- https://cdn.shopify.com/s/files/1/0427/9291/1007/files/20786288764.pdf
- https://cdn.shopify.com/s/files/1/0427/8996/1884/files/xemirasunoxa.pdf
- https://cdn.shopify.com/s/files/1/0431/0256/8599/files/97628861254.pdf
- https://cdn.shopify.com/s/files/1/0430/0419/9075/files/house_of_elliot.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11067845032.pdf
- https://cdn.shopify.com/s/files/1/0431/8268/6367/files/13647337039.pdf
- https://cdn.shopify.com/s/files/1/0429/9754/7157/files/90316756107.pdf
- https://cdn.shopify.com/s/files/1/0433/4452/7511/files/30678304812.pdf
- https://cdn.shopify.com/s/files/1/0431/0011/0999/files/konakexexanuzakamu.pdf
- https://cdn.shopify.com/s/files/1/0433/1018/6654/files/gususabumoje.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_off00004183.bin` `0fa27f42d5d9d52a2362e0f09288ccaf9027b7e669598e1d85afba8b810963b8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4183	5404 bytes
`font_01_sfnt_off000053f2.bin` `f34738f02f3489c48ef02dd3bfe9bed1e122a170954f49bca70fd5a21f5dc66d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x53F2	9804 bytes

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