PDF malware analysis — malicious · 160ad9c19f28e7b6

MALICIOUS

PDF

43.5 KB Created: 2020-08-31 11:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 930b6ba983f16c24849d44c3302b73b2 SHA-1: ffa900500f6497bb830eec42d44ad5dbef57de91 SHA-256: 160ad9c19f28e7b6df6c4f04d1e301e5652be1cd912a92a164ef33458d607d93

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which, https://ttraff.ru/wix?keyword=cash+flow+statement+direct+method+questions+and+answers+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and appears to be a lure related to financial statements. The presence of numerous other PDF links suggests a link farm or SEO poisoning attempt to drive traffic to malicious infrastructure.

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=cash+flow+statement+direct+method+questions+and+answers+pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://cdn.shopify.com/s/files/1/0433/6808/7711/files/interview_skills.pdf
- https://cdn.shopify.com/s/files/1/0430/9060/8285/files/nudim.pdf
- https://cdn.shopify.com/s/files/1/0434/3303/3877/files/jufuxe.pdf
- https://static.usrfiles.com/ugd/b8c837_f3f4a0e144e5436d86d7252bc50e2254.pdf
- https://static.usrfiles.com/ugd/edb4a7_58d4bee611b74727aaa4fb9f5ffe2b92.pdf
- https://static.usrfiles.com/ugd/9ea9b6_8d326aaa7da942bc80cf0aed212b53b6.pdf
- https://static.usrfiles.com/ugd/f80014_6e4834bd006f4d4ca24e62c1ff44f9fc.pdf
- https://static.usrfiles.com/ugd/b8c837_46201d8eba5c486faf7cc6226747510c.pdf
- https://static.usrfiles.com/ugd/ce77c6_c5eaf1ec4fdc4407a5807aac59909dde.pdf
- https://static.usrfiles.com/ugd/3b7182_9bff7281f59b400b8d89e4ca99316d07.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_off00006a48.bin` `cc78209b4328de73d695def2b8a28d4ad2fd82a6dcb7f8d3d2acafbf249189ab`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6A48	5516 bytes
`font_01_sfnt_off00007cf4.bin` `2ce75ed48bd440fb13dd3072317ce3e7e90cf44225abb646ace57ab2472a0c67`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7CF4	10856 bytes

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