PDF malware analysis — malicious · cbcfea774be27f27

MALICIOUS

PDF

47.3 KB Created: 2020-08-25 05:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 349079ba430c72f4e3b2253ae8cdcd7b SHA-1: b237830de749c79fc31bf95621ef5907b077e521 SHA-256: cbcfea774be27f27fb703b42f878868390a1ad310f41e92f4817a7be20f23a1e

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL, suggesting it is the primary lure. The ML classifier also strongly flagged this PDF as malicious. The presence of multiple embedded PDFs and a link farm suggests an attempt to obscure the malicious destination.

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=surface+area+to+volume+ratio+lab+report
- http://gabiralad.leemschoir.com/uploads/1/3/0/8/130874493/2628420.pdf
- https://cdn.shopify.com/s/files/1/0439/9860/9566/files/33108924412.pdf
- https://cdn.shopify.com/s/files/1/0430/2084/5210/files/degolezeguzewovorilov.pdf
- https://cdn.shopify.com/s/files/1/0434/0508/2776/files/understanding_economic_systems_worksheet_answers.pdf
- https://cdn.shopify.com/s/files/1/0429/4829/6863/files/mahabharat_tv_serial_star_plus_song.pdf
- https://cdn.shopify.com/s/files/1/0433/9925/0072/files/vakevuk.pdf
- https://cdn.shopify.com/s/files/1/0431/0279/7986/files/how_to_type_in_italics_on_discord.pdf
- https://cdn.shopify.com/s/files/1/0428/2174/6854/files/difference_between_elastic_and_inelastic_collision.pdf
- https://cdn.shopify.com/s/files/1/0427/8878/2236/files/tagafofopapovenelolixejun.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_off00006d99.bin` `4b816a70ca34cc2d9c50601683af6232f60321c7768037548f539f32761b7601`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6D99	5060 bytes
`font_01_sfnt_off00007ecf.bin` `7990c3857499fbb026d70f077306bd64b34037c7748763e3bc41acb163cf6b62`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7ECF	10360 bytes
`font_02_sfnt_off0000a224.bin` `b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA224	4324 bytes

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