PDF malware analysis — malicious · 7a791f23917dd97b

MALICIOUS

PDF

43.8 KB Created: 2020-09-05 22:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 0a43ba0f758dca50d420e617cb9b032b SHA-1: 6f12758aef19bc3a3f61bafd2bfef3c079a1fbf3 SHA-256: 7a791f23917dd97b7091182d54cdf2dc5305d436466ecc5b06abb8f95f591d91

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file contains numerous links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting it is an answer key for algebraic expressions, likely a lure to entice users to click the malicious link. The presence of a mass external PDF link farm further indicates a malicious intent to distribute content through potentially compromised or malicious sites.

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.me/pify?keyword=translate+algebraic+expressions+answer+key+pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/b8c837_73340e03bf734e0db3ff44b49dbedbd9.pdf
- https://static.usrfiles.com/ugd/35c6e2_58b1cb3a3efb4ce0ac3f265f9369b8a3.pdf
- https://static.usrfiles.com/ugd/8c7d07_21ca59a9d8c94dd0aaba5ea3d19e7af3.pdf
- https://static.usrfiles.com/ugd/704f6c_b8f5c3d961e84dee9fba9142ad7b1a4e.pdf
- https://static.usrfiles.com/ugd/7f614e_b482aae5fb0f45f889e5839725d2ce37.pdf
- https://static.usrfiles.com/ugd/739437_1fd1d1e4dfb44052a6ae1fad12db73ff.pdf
- https://cdn.shopify.com/s/files/1/0434/7301/0845/files/85630512893.pdf
- https://cdn.shopify.com/s/files/1/0432/8367/7339/files/kirbys_dream_land_2_rom_romsmania.pdf
- https://static.usrfiles.com/ugd/a86d68_ab4b8ab148754f1c9f9544eeb5856c24.pdf
- https://static.usrfiles.com/ugd/e5a943_94faa6a05a024968a6e8e2656a64f151.pdf
- https://static.usrfiles.com/ugd/4d935e_7c77ec4cf97f475c92f3981de402ac12.pdf
- http://world.casio.com/edu_e/ENext
- 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_off000064ff.bin` `aaca2ec6d0a80aa770fea763f25e5ab7e3b389ce10034de085909da7a17b7d16`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x64FF	5740 bytes
`font_01_sfnt_off000078b5.bin` `a297975373bd7972b0927300da9fa182095e1f691fe3b2824c5842307e8ac238`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x78B5	13116 bytes

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