PDF malware analysis — malicious · ac58a3beb09c9e86

MALICIOUS

PDF

41.4 KB Created: 2020-10-29 05:16:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14

MD5: eccea8e765049a69424ecd7b885649e6 SHA-1: 36cb95e74fa0b0aa13ae3801256ffe1703cd5da1 SHA-256: ac58a3beb09c9e865a02d6a561c922f11432b68efcdf138370c57ddfeff7b7d4

194 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains numerous embedded links, many of which point to redirector infrastructure. The primary malicious URL identified is https://cctraff.ru/strik?keyword=abnormal+softening+of+the+nails+is+called, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting an attempt to disguise the malicious destination under a medical pretext. The presence of a large number of PDF links and the ML classifier's high confidence score further support the malicious classification.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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.
Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK

PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
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://cctraff.ru/strik?keyword=abnormal+softening+of+the+nails+is+called In PDF document text
- https://cdn-cms.f-static.net/uploads/4375690/normal_5f8d03acd45f2.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4372963/normal_5f93feb4a2dbd.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4380857/normal_5f9085f891c22.pdfIn PDF document text
- https://zeginuvo.weebly.com/uploads/1/3/0/7/130775519/9792021.pdfIn PDF document text
- https://xuzowezawejinat.weebly.com/uploads/1/3/4/3/134378303/920165.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366348/normal_5f8753ee8d3a8.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4369182/normal_5f8b0b5c01567.pdfIn PDF document text
- https://vekaluledezo.weebly.com/uploads/1/3/4/2/134235689/nofeki-jewoxiwuf-bofim-jilevul.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- https://s3.amazonaws.com/buxoparadazegu/bumewifarutipot.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/3b534f69-e3dd-4825-9cfb-3e1ca758bf97/lexavuzen.pdfIn PDF document text
- https://s3.amazonaws.com/jozetej/puritan_age_in_history_of_english_literature.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0431/0538/6647/files/levidaxo.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/925de030-dd2e-485d-b1c3-7e417f552c34/92717220165.pdfIn PDF document text
- https://s3.amazonaws.com/felasorarabipis/square_of_numbers_from_1_to_50.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0493/5850/4092/files/directions_to_philadelphia_airport_long_term_parking.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0497/8570/0519/files/best_classical_music_ringtones_apk.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00005939.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5939	5352 bytes
SHA-256: `0365368b24bb8e57713f0ac38565fe9bc0b811046c1c8b0229852e694b2ff2f9`
`font_01_sfnt_off00006b28.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6B28	9096 bytes
SHA-256: `b3d5dd5b062ef387c28a090f61acd4732be2d0753cbb79d92dde5b3f622176b6`
`font_02_sfnt_off00008a30.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8A30	4324 bytes
SHA-256: `b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c`

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