PDF malware analysis — malicious · a3e883a57f1f1383

MALICIOUS

PDF

38.0 KB Created: 2020-11-02 06:12:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26

MD5: ef2629748077aac923bf2149e9d76e62 SHA-1: f87a7885786c382cce7d01e346d7c196fd4a02f7 SHA-256: a3e883a57f1f13832eee4a53f30dca5daa46760d0a2e5916b21805bec56c666a

94 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded URL that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting it is an instruction manual, likely a lure to encourage clicking the malicious link. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 3

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.
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.cc/123?keyword=contra+nes+instruction+manual In PDF document text
- https://cdn-cms.f-static.net/uploads/4411231/normal_5f989b88ed356.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4416806/normal_5f9a8c17a34f3.pdfIn PDF document text
- https://pugojowu.weebly.com/uploads/1/3/4/3/134334477/e347cdcc5.pdfIn PDF document text
- https://rawebitor.weebly.com/uploads/1/3/4/3/134337567/3bc49c24395.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4380383/normal_5f959ab5c5e74.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/sepawi/montreaux_chocolate_usa_case_summary.pdfIn PDF document text
- https://s3.amazonaws.com/bidejonixom/bulob.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0493/3360/0415/files/harrisburg_high_school_football_maxpreps.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0503/0736/7108/files/biology_genetics_practice_problems.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0496/0662/3384/files/41540983072.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00005977.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5977	4848 bytes
SHA-256: `d55f1bbf7d3b2ba7729586b58af78ab5a4b98f253ad8427731f59522efd60e82`
`font_01_sfnt_off000069d2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x69D2	9896 bytes
SHA-256: `9ee950d051b04addd8ce5dc9c9305abadbc577138ecc155b56f477461983207c`

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