PDF malware analysis — malicious · cde0c366a5293bcb

MALICIOUS

PDF

43.3 KB Created: 2020-08-31 11:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: e94eb27d96ecbfae97631f513ae101a2 SHA-1: 91dc9b4651d85541a425d7918aed3352b89e5fc9 SHA-256: cde0c366a5293bcbbc05abeff8c5f77504c4f488b667f2e24c7c40d9ba9a4edd

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and other links that appear to be part of a link farm designed to attract search engine traffic and potentially lure users to 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.cc/wix?keyword=hoi4+l%25C3%25A4nder+tags
- https://cdn.shopify.com/s/files/1/0433/4151/2855/files/chart_5011_symbols_and_abbreviations_used_on_admiralty_charts.pdf
- https://cdn.shopify.com/s/files/1/0433/0032/3478/files/93790978293.pdf
- https://cdn.shopify.com/s/files/1/0435/6079/6318/files/chinese_herbal_medicine_materia_medica_bensky.pdf
- https://cdn.shopify.com/s/files/1/0433/8358/6977/files/rowajazol.pdf
- https://static.usrfiles.com/ugd/6f9b04_fb5e2035d7d44b5a88de449c2fd8a407.pdf
- https://static.usrfiles.com/ugd/d902bb_690bc17e13c74736829a5ae2ea6ea37b.pdf
- https://static.usrfiles.com/ugd/5bb01c_227beaeb4e0e456da197437b27e6cc10.pdf
- https://static.usrfiles.com/ugd/a640e9_30a39d21269c42f8ae5612b7276ef9b3.pdf
- https://static.usrfiles.com/ugd/7603ae_d4c70b5896c6493b98868bd3ff42b453.pdf
- https://static.usrfiles.com/ugd/2274a7_2e3ca6eb1f7349d3b2c131d5dde4e782.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_off00005cf2.bin` `fed57b2436e845eedd1d0ab78e5f451cec83b1eab14a37ab2ec9aaf685d64987`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5CF2	5068 bytes
`font_01_sfnt_off00006d9b.bin` `5a35f8f613dc44f1bce89b7dd9eb26a57550e346dcc68ce783dcb9985a6210ab`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6D9B	10964 bytes
`font_02_sfnt_off0000916f.bin` `05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x916F	4324 bytes

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