PDF malware analysis — malicious · 7c6ecfb05b9f4322

MALICIOUS

PDF

41.7 KB Created: 2020-10-31 17:53:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 600498f2f9053d4d2f67ce46de1183ef SHA-1: d6bd8f56106aa5c803b9f65cbbc991251b2f0c08 SHA-256: 7c6ecfb05b9f43229b7638df13a6606d32619e62d044831acd4d731db0eb56a2

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with at least one pointing to a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body contains a URL that is also present in the heuristics, suggesting a potential lure or distribution point.

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.link/123?keyword=magnitude+of+displacement+equation
- https://cdn-cms.f-static.net/uploads/4375344/normal_5f934478a7feb.pdf
- https://cdn-cms.f-static.net/uploads/4380701/normal_5f8ed993b9699.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://uploads.strikinglycdn.com/files/8d56806c-723c-4ba8-b7f5-54a4ada3b52d/xumumiwuz.pdf
- https://uploads.strikinglycdn.com/files/8e8cc5e2-a2ed-49f4-baac-4a0d21d48ea6/57328181873.pdf
- https://cdn.shopify.com/s/files/1/0430/4361/8965/files/bufutosuzus.pdf
- https://s3.amazonaws.com/sedimeraxufi/anemia_falciforme_usp.pdf
- https://cdn.shopify.com/s/files/1/0268/7821/4319/files/injustice_gods_among_us_apk.pdf
- https://cdn.shopify.com/s/files/1/0506/6660/2694/files/woputata.pdf
- https://cdn.shopify.com/s/files/1/0501/3936/5546/files/19766057793.pdf
- https://cdn.shopify.com/s/files/1/0499/8316/0483/files/32047455542.pdf
- https://cdn.shopify.com/s/files/1/0427/8393/2582/files/fugidubejilekijutemo.pdf
- https://s3.amazonaws.com/salade/41688882929.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/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000060ed.bin` `f20973ae6048503b66afbb184d136b6d2a10c1e21eea0b84d8bc04d431b6cf9e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x60ED	5512 bytes
`font_01_sfnt_off000073ab.bin` `d2e4bbb694c77ea7391034ef25aac1e28a45d3f9969f12301836e51547c33280`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x73AB	11260 bytes

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