PDF malware analysis — malicious · 6a4612872bf75003

MALICIOUS

PDF

52.7 KB Created: 2020-09-03 00:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 47d0fc7c436e0f0a1e86bc36c80b9b33 SHA-1: 8effc96c269d2471a54c0e487c7ed80e13a79866 SHA-256: 6a4612872bf75003cf7bc3c3c39182b5622ac2fe307c46477bc567a0899848b3

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The ML classifier strongly indicates maliciousness, and the presence of a redirector suggests an attempt to lead the user to a malicious site for further exploitation or phishing.

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=diagramming+sentences+with+adjectives+worksheets
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://cdn.shopify.com/s/files/1/0427/9785/8972/files/78166803676.pdf
- https://cdn.shopify.com/s/files/1/0433/5727/4270/files/billi_comedy_video_3gp_tinyjuke.pdf
- https://cdn.shopify.com/s/files/1/0429/4295/5676/files/56557294857.pdf
- https://cdn.shopify.com/s/files/1/0429/6504/1311/files/against_humanity_cards.pdf
- https://cdn.shopify.com/s/files/1/0434/2841/3607/files/valuterekipedenas.pdf
- https://cdn.shopify.com/s/files/1/0432/4573/2007/files/56783845196.pdf
- https://cdn.shopify.com/s/files/1/0437/4275/7029/files/dejani.pdf
- https://cdn.shopify.com/s/files/1/0437/2240/8087/files/2_look_oll.pdf
- https://static.usrfiles.com/ugd/97368a_b1dd17dc9d364beeb5be47abb935e1e7.pdf
- https://static.usrfiles.com/ugd/aff7ca_680467558e85410db0481e8c4f246059.pdf
- https://static.usrfiles.com/ugd/a44510_29a8777cbfa14925875500e81bc8e649.pdf
- https://static.usrfiles.com/ugd/b6bf5b_30ea2bd640e34d43a5d5d62d7ccf1ee7.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_off00008800.bin` `7ffc194b10f5f9f99bfdbb5c18363ce632419df700e431d28d438377f88cccd2`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8800	5612 bytes
`font_01_sfnt_off00009b0f.bin` `0f275ccfef5500a286aa94cf23587bc1a65d7398d34e581d4e709193c18f1d60`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9B0F	13524 bytes

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