PDF malware analysis — malicious · 5cb0ebe39284887c

MALICIOUS

PDF

41.9 KB Created: 2020-08-29 16:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 560b408b7790c5d127cf6f36e765fa1e SHA-1: 6ac6cad643ec265f67ff20775b648a7f3175c00d SHA-256: 5cb0ebe39284887ce0b983ec4a5c8cd6c45b205b913f44a65be8952e780ff4b9

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a title related to an exercise, suggesting a lure. The presence of a link farm heuristic further indicates an attempt to manipulate search results or distribute content through multiple URLs.

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.com/wix?keyword=exercice+mesure+de+dur%25C3%25A9e+cm2+a+impri
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/b8c837_0e25616a42784c19918a1d75b5424f0e.pdf
- https://static.usrfiles.com/ugd/b8c837_947eab0c829a4592a34ce21e14ef09e8.pdf
- https://static.usrfiles.com/ugd/b8c837_95a2de1656cb4c7db8a4ad7c9169c6ee.pdf
- https://static.usrfiles.com/ugd/b8c837_c9e3139bcce8430f922dac828fd2f76d.pdf
- https://static.usrfiles.com/ugd/b48b60_a1ba0da2adbc43f9b2eac5241d321779.pdf
- https://static.usrfiles.com/ugd/6cf392_af9c388db1f7447fadc47c9352d4f115.pdf
- https://static.usrfiles.com/ugd/b8c837_a5508295521a42dbb311f46f7108ca30.pdf
- https://static.usrfiles.com/ugd/b98abb_09ae4f1caee449ea961f83ddb9dfc51f.pdf
- https://static.usrfiles.com/ugd/b8c837_ed2611ed69e142f2a28598a3986cfe9d.pdf
- https://static.usrfiles.com/ugd/2e4eb4_6edc75832fdf4862a15377c2d2883489.pdf
- https://static.usrfiles.com/ugd/e3ed1f_62f7051a6aa44f00af4c162dbf46a867.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
`stream_005_off000072a3.bin` `5dc8cdae13b87e21c5edad2d1c751bb3ccba07207b96fa349a4b9720e139f65b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x72A3	11944 bytes
`font_00_sfnt_off00006055.bin` `40d4f1454233ec5fe1c0d981999a52451589b1ee54cb4635ab88314b3123eeb8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6055	5488 bytes

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