PDF malware analysis — malicious · 24f65dd98f4cd5f2

MALICIOUS

PDF

40.1 KB Created: 2020-08-31 02:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: d75bda37459e457d80f46f3ec9e4f962 SHA-1: f45d67135a2289de74d18679861ee9a1652982ff SHA-256: 24f65dd98f4cd5f2d6b1c50a2b2512b026b95e4242dfef49f8a86353277e7370

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be part of the link farm, suggesting a lure related to product pricing. The primary malicious IOC is the redirector URL, which likely leads to further malicious 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.ru/wix?keyword=gopro+hero+4+price
- https://static.usrfiles.com/ugd/b8c837_70c3ed30593944dfab658a37850a33e9.pdf
- https://static.usrfiles.com/ugd/b8c837_e7651669e1064a968952ffd9e7985694.pdf
- https://static.usrfiles.com/ugd/cbe7f7_fb39b1f987a54fff9e77df9c81032ed4.pdf
- https://static.usrfiles.com/ugd/b8c837_a8f1667d866e4a3aa3ca1cf1a30ec6b5.pdf
- https://static.usrfiles.com/ugd/9c43ec_87ca5cc291f24fa0aac09e4145d0df44.pdf
- https://static.usrfiles.com/ugd/516793_60aeba465dcf480a956736dfed4a7fd7.pdf
- https://static.usrfiles.com/ugd/b98abb_f16dc38588f24fb694c9c10136ce3457.pdf
- https://cdn.shopify.com/s/files/1/0433/0812/2270/files/70970806919.pdf
- https://cdn.shopify.com/s/files/1/0431/7331/4715/files/grammar_worksheets_upper_intermediate.pdf
- https://cdn.shopify.com/s/files/1/0432/8030/2244/files/fbi_message_meme_template.pdf
- https://cdn.shopify.com/s/files/1/0434/8185/8214/files/wajofomibilo.pdf
- https://cdn.shopify.com/s/files/1/0434/5721/6678/files/13143652902.pdf
- https://cdn.shopify.com/s/files/1/0431/7049/6661/files/lunejovotoraluvugowopo.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_off00005bdc.bin` `5d394da616481ee7ac7a4fbd5c9e463898aa45fd2d6f9e83070ca9d48cdbeed3`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5BDC	4720 bytes
`font_01_sfnt_off00006beb.bin` `27f78804b3f9bf956d15995a7c71bccde9d23b15e65d367acde882d680507d3d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6BEB	12612 bytes

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