PDF malware analysis — malicious · 6709fe050983c993

MALICIOUS

PDF

38.9 KB Created: 2020-08-30 04:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f9e8e8048f22a6d253ebbb2cd73cb7f6 SHA-1: 33aeea9f8da27b0f49a4f6d07326dd38e5eb1cfe SHA-256: 6709fe050983c9937fb0cf9068287c0b43c34ad559ea702b3e250065ed7b1c25

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, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, contains references to "Brothers keepers 7" and numerous URLs, many of which are benign Shopify links, likely part of a link farm to obscure the malicious destination. The ML classifier strongly indicated maliciousness.

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=brothers+keepers+7
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://cdn.shopify.com/s/files/1/0463/9673/5643/files/girl_scout_cookies_growing_guide.pdf
- https://cdn.shopify.com/s/files/1/0432/5244/9435/files/ruratijinalonufesamuwane.pdf
- https://cdn.shopify.com/s/files/1/0434/6265/6152/files/laxuf.pdf
- https://cdn.shopify.com/s/files/1/0439/4093/7896/files/dirimixiwubop.pdf
- https://cdn.shopify.com/s/files/1/0432/3095/3630/files/six_sigma_book.pdf
- https://static.usrfiles.com/ugd/b8c837_4e7b5ca34de4477683cca469eae79e17.pdf
- https://static.usrfiles.com/ugd/ddb60a_5bdf1935b68144ed92f59465282b80fd.pdf
- https://static.usrfiles.com/ugd/ae059d_ee7d0b57e4c24302946dcd2e115de05e.pdf
- https://static.usrfiles.com/ugd/9e53d4_661523ee20f447cab5fb9b650fb48ee6.pdf
- https://static.usrfiles.com/ugd/b8c837_90377477b0904e5ababda945b3dd6dce.pdf
- https://static.usrfiles.com/ugd/b8c837_f68ba551c4664203a2ecacec1817c8da.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_off00005a40.bin` `2b5ea5a8b3c73e1e2f51c7bcbd3e16f307d1d0103e98f233cf844623ee8bc37f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5A40	4860 bytes
`font_01_sfnt_off00006ace.bin` `dddbdab8c7fbfd4cc6bd5483d63d20245dfc1359ef9ddd3ddc09cd48cb5d376e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6ACE	10744 bytes

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