PDF malware analysis — malicious · 8991b98a14870ea8

MALICIOUS

PDF

40.0 KB Created: 2020-08-20 23:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: bfb7a25115bdb095a37e546eed7faa5d SHA-1: 3c9374f4b8c3a71d2fd4680288264b5b88c24c22 SHA-256: 8991b98a14870ea821d3342af51805ebde94a782d1cea6bc8b5d99024eb5717d

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one critical heuristic identifying it as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'official backgammon rules'. This URL, https://ttraff.cc/pify?keyword=official+backgammon+rules+pdf, redirects to malicious infrastructure. The presence of numerous external PDF links, including one to a potentially malicious domain, further supports a malicious intent, likely to distribute further malware or phishing content.

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.cc/pify?keyword=official+backgammon+rules+pdf
- http://sufef.drainagesolutionsdirect.co.uk/uploads/1/3/1/4/131438428/kitupopuwato.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://cdn.shopify.com/s/files/1/0434/4138/9720/files/john_deere_technical_manuals.pdf
- https://cdn.shopify.com/s/files/1/0454/5609/7432/files/23127050902.pdf
- https://cdn.shopify.com/s/files/1/0435/5417/7183/files/mapujobizobifegaje.pdf
- https://cdn.shopify.com/s/files/1/0431/5725/8401/files/38370976064.pdf
- https://cdn.shopify.com/s/files/1/0431/7564/1247/files/viva_pinata_guid.pdf
- https://cdn.shopify.com/s/files/1/0430/8857/6661/files/nidesesebepilarogeno.pdf
- https://cdn.shopify.com/s/files/1/0428/6762/2055/files/99293515950.pdf
- https://cdn.shopify.com/s/files/1/0431/8298/1278/files/lisuzu.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_off00005f62.bin` `706ec40ab90386c582e9f6069ebca703f3d30b13ea70e45cb9652e737d6150f8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5F62	5708 bytes
`font_01_sfnt_off000072a7.bin` `f49d6d98748b9f44b8a9f135d754f07131bb41baccf72b8f0eb878a2430452e7`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x72A7	9704 bytes

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