PDF malware analysis — malicious · 71feac08ff26d62a

MALICIOUS

PDF

38.7 KB Created: 2020-08-30 00:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: ef9bc37a72cff9e18daaa5289766fd4b SHA-1: 400205940521533b0b20d0580aa5418625b3a9a1 SHA-256: 71feac08ff26d62a0af4ee966b9ebae54796b6c4f22d31a9e4fe5caa65a96624

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that point to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the primary malicious URL, suggesting an attempt to lure the user to a compromised site. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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.ru/wix?keyword=software+engineering+roger+pressman
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/b8c837_295d1b478cd3491e9d6f63357d716718.pdf
- https://static.usrfiles.com/ugd/b8c837_2614918459544740915951193849d94d.pdf
- https://static.usrfiles.com/ugd/9dda13_d1f0d63a5437498f89ea86cad4a32bcc.pdf
- https://cdn.shopify.com/s/files/1/0433/3902/2494/files/tasanamawadetupobipi.pdf
- https://cdn.shopify.com/s/files/1/0434/3506/5510/files/telazabafijun.pdf
- https://static.usrfiles.com/ugd/b8c837_335e42b09e474ea6aae944e6a41eac6f.pdf
- https://static.usrfiles.com/ugd/5ad03d_49549933802c48db858cc4f0cfc7a022.pdf
- https://static.usrfiles.com/ugd/d54300_41b2d949c56141c591ccb4dff7aea521.pdf
- https://static.usrfiles.com/ugd/9e14ca_f1d167030a6146d8a39d5c74240bc75e.pdf
- https://static.usrfiles.com/ugd/b58d21_8a062056322f4268b091e543fa2bb678.pdf
- https://static.usrfiles.com/ugd/c4ccc4_f361f642c5114958b9cbbfcb2ee25120.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_off00005984.bin` `4c5da9c5a9b8ab4c2b918dc645c134651b68a290ca645889c97f42dcc732448b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5984	5384 bytes
`font_01_sfnt_off00006bcf.bin` `a9ef495ec8d13f5bcb37b760e340579c459bd785a98ad5007a43fbe26ccfdfdc`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6BCF	10132 bytes

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