PDF malware analysis — malicious · 9613143eb25741cb

MALICIOUS

PDF

40.5 KB Created: 2020-08-21 08:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: fb1915db78ebc9b5ecf0824d329f08b0 SHA-1: 271fee003ae8928d3b22c8a293fa57d5f8ad86cd SHA-256: 9613143eb25741cb938a0c077d659ed40e6f61d1f6897bc942f7284d09747f0f

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a known malicious redirector. The primary malicious URL identified is https://ttraff.ru/pify?keyword=boogie+woogie+piano+riffs+pdf, which is designed to lure users into downloading further malicious content. The document body itself is heavily obfuscated and contains a mix of legitimate-looking text and embedded URLs, further supporting the link farm and redirection attack pattern.

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/pify?keyword=boogie+woogie+piano+riffs+pdf
- http://duvokafo.catstitchstudio.com/uploads/1/3/2/6/132682090/1636654.pdf
- http://files.etowaheagleswrestling.com/uploads/1/3/0/7/130775231/4e49f123d51ab2f.pdf
- https://cdn.shopify.com/s/files/1/0439/6105/7438/files/48647972009.pdf
- https://cdn.shopify.com/s/files/1/0430/0485/4426/files/zofabavuvo.pdf
- https://cdn.shopify.com/s/files/1/0432/3803/1518/files/35374333599.pdf
- https://cdn.shopify.com/s/files/1/0431/4890/2560/files/1849270379.pdf
- https://cdn.shopify.com/s/files/1/0434/7982/6582/files/bobupuzerebogologewave.pdf
- https://cdn.shopify.com/s/files/1/0434/9699/7030/files/74924085169.pdf
- https://cdn.shopify.com/s/files/1/0434/0911/3253/files/64935558242.pdf
- https://cdn.shopify.com/s/files/1/0437/7152/7319/files/meningitis_por_bacilos_gram_negativos.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nemopijudesukofareran.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00005ff3.bin` `66e6fac2b042f9e3ef5d9d3b9d938c71a0574bfc9428341ae26b30be163fb1a4`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5FF3	5320 bytes
`font_01_sfnt_off00007229.bin` `ef3d3569753792ded76fe7d6fb242319fd83253c21d79b5249b644bb8e25f4fb`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7229	10516 bytes

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