PDF malware analysis — malicious · a885f99386fe0b90

MALICIOUS

PDF

49.2 KB Created: 2020-09-01 12:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 39443f07694d1586c8e1d187774abe2b SHA-1: 534572b533833d647e0f6196892f79d74a9bf9db SHA-256: a885f99386fe0b900b7df1f0baabfdad2994860e64583a2f566163b16f3b9821

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass of external links, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Autocad 2017 activation code', suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly supports the malicious nature of this PDF.

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=autocad+2017+activation+code
- https://static.usrfiles.com/ugd/1ee69b_37bd182f8b254d5ebb78e7bb4f08610b.pdf
- https://static.usrfiles.com/ugd/b6edda_ee301a6534104e34a25308628cbef140.pdf
- https://static.usrfiles.com/ugd/0dcf4b_21a20bd7d63542c2beacef9d8899d960.pdf
- https://static.usrfiles.com/ugd/8127dd_eec49d829e3446e68d2ec6acf855192d.pdf
- https://static.usrfiles.com/ugd/4c1554_cbd2d842e09b45a6a51d8c48c6df74f3.pdf
- https://static.usrfiles.com/ugd/756799_5ddcbd77fd4c4cffbfae4fd8d5535182.pdf
- https://static.usrfiles.com/ugd/41f880_3dfbd8ebf1324f5f965661225e29df86.pdf
- https://static.usrfiles.com/ugd/764aaa_256b53d15832460886f8cd41c4f10591.pdf
- https://static.usrfiles.com/ugd/b8c837_70bdf55477a54863a2aab8f1195cbc7b.pdf
- https://static.usrfiles.com/ugd/c7ef1a_f67f70f15d114f06957252fb9e6b3388.pdf
- https://static.usrfiles.com/ugd/b916f4_ad76691cbb4648549da8cfa7e4a960b1.pdf
- https://static.usrfiles.com/ugd/83d902_b38b528b76c34e5d9ee7b10626002e72.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00006476.bin` `d434f76e81bc32519fc73b26225225308f03a5d9abc2878532aee1edeec19cf7`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6476	5084 bytes
`font_01_sfnt_off000075de.bin` `d9c90fd259e82b261a41492949dfae7a9ce7c8b899aeb387feb0d0a28e5fd5cc`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x75DE	8316 bytes
`font_02_sfnt_off00008ca0.bin` `b886e9c309884ca9fdca55d1bd5a4f1900db4092a1bbfe1563c10fe0bff95d18`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8CA0	14128 bytes

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