PDF malware analysis — malicious · bac116a77e25066d

MALICIOUS

PDF

40.5 KB Created: 2020-09-03 07:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 1dc85497bddd21f2334d9607322e34d8 SHA-1: 4f3eef5bd56c7dc23a5afee287c447f6c1ef1d2d SHA-256: bac116a77e25066d65961a4da1085d6abf47b4356f47f370a1fd3b9de43f7a77

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a prominent link that redirects to a known malicious domain, disguised with a seemingly benign keyword. The document body, though heavily obfuscated, contains the same redirector URL and a large number of benign-looking PDF links hosted on Shopify, likely to mask the malicious activity. The ML classifier strongly flagged this PDF as malicious.

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.link/wix?keyword=cover+letter+template+new+zealand
- https://cdn.shopify.com/s/files/1/0433/3902/2485/files/miller_analogies_test_practice.pdf
- https://cdn.shopify.com/s/files/1/0432/0913/0143/files/athens_airport_terminal_map.pdf
- https://cdn.shopify.com/s/files/1/0429/6556/5589/files/the_triangle_inequality_theorem_worksheet.pdf
- https://cdn.shopify.com/s/files/1/0437/4288/8097/files/nigasexijidupizerup.pdf
- https://cdn.shopify.com/s/files/1/0463/2490/8193/files/66962721665.pdf
- https://cdn.shopify.com/s/files/1/0432/4504/3876/files/vejutikegavip.pdf
- https://cdn.shopify.com/s/files/1/0432/8046/6080/files/75120269293.pdf
- https://cdn.shopify.com/s/files/1/0462/7755/8432/files/siloxuxumoxitulo.pdf
- https://cdn.shopify.com/s/files/1/0431/9281/1669/files/chinese_link.pdf
- https://cdn.shopify.com/s/files/1/0430/7786/1527/files/94201881971.pdf
- https://static.usrfiles.com/ugd/0d089b_079e276cfbf64b108fbef852fe9852b9.pdf
- https://static.usrfiles.com/ugd/f34823_eaebe9a488814d0fa5bf204982cc009a.pdf
- https://static.usrfiles.com/ugd/ab059d_88deeb9dfeb84944ac623ae488236e7e.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_off000060c3.bin` `45fdb081de81beb9067728f3a05f28852ee98b613a3412bb1b98c3be0a946d6d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x60C3	5036 bytes
`font_01_sfnt_off000071e3.bin` `fbbdb9d1a9a751005a9cc3e836207a502a721f512ade1e6f31e1b875d6d0ef14`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x71E3	10444 bytes

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