PDF malware analysis — malicious · 2cff2341b3b87d44

MALICIOUS

PDF

71.7 KB Created: 2020-12-14 22:16:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 0d89201a34601034270dbd0ddf1b2bc7 SHA-1: 7af9f87bf0d99cecb580cb3f0001aa67b677f3fa SHA-256: 2cff2341b3b87d44352045ddb3f467d0536bd491b1ae717704953a858c658904

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/aws?utm_term=free+first+grade+math+subtraction+worksheets'. The document body, though heavily obfuscated, suggests a lure related to 'free first grade math subtraction worksheets'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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.
ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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/aws?utm_term=free+first+grade+math+subtraction+worksheets
- https://cdn-cms.f-static.net/uploads/4369330/normal_5f9154b3c5de5.pdf
- https://cdn-cms.f-static.net/uploads/4391611/normal_5fbe67eb82975.pdf
- https://cdn-cms.f-static.net/uploads/4416918/normal_5fb5174a41bd9.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://s3.amazonaws.com/xajowu/gujomalaximiwo.pdf
- https://s3.amazonaws.com/gebukil/8807370715.pdf
- https://s3.amazonaws.com/nowokil/xazimudedefoniko.pdf
- https://s3.amazonaws.com/rodiligarexo/free_hotel_california_original_song.pdf
- https://s3.amazonaws.com/kovilowab/instagram_design_template_app.pdf
- https://uploads.strikinglycdn.com/files/d07ae698-56aa-446b-a391-43a9bfeeb309/potidovazudevuvetega.pdf
- https://s3.amazonaws.com/zebarufuridorur/abcd_malayalam_movie_bgm_music.pdf
- https://uploads.strikinglycdn.com/files/eb3f1a17-c058-4add-9f0b-76a8d8b23165/nasidu.pdf
- https://static1.squarespace.com/static/5fc0d12c3dfdd95b60d4a66f/t/5fc192599ee0f32b878e85d4/1606521435385/bisevopaxasupumamobap.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_off0000d855.bin` `9c51e07dc84e0a5d150db848bb361b6e75a4e7ee72791b386c683af60eaa049a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD855	5656 bytes
`font_01_sfnt_off0000eb84.bin` `6c9dc1eca04a01405ae6e3c4d3e0b016849522d57ef64718049997a61bfdd87b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB84	11304 bytes

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