PDF malware analysis — malicious · 6b93b73edb5ce368

MALICIOUS

PDF

41.2 KB Created: 2020-09-06 04:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: c1aaaa26d6193239c5eb2b5bf798e8d2 SHA-1: 534fa61b92b3a0f68d3b6c81d83d4703dee8876a SHA-256: 6b93b73edb5ce3689ce243eb603bfe3867f15cf38efeb9f43fbab938abb20a95

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector. This suggests a tactic to disguise malicious activity within a larger, seemingly legitimate link farm, likely intended to trick users into clicking the malicious URL. The ML classifier also strongly indicated maliciousness.

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.me/wix?keyword=oxigenio+dissolvido+na+agua+pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://cdn.shopify.com/s/files/1/0440/6896/2469/files/apnea_obstructiva_del_sueo_pediatria.pdf
- https://cdn.shopify.com/s/files/1/0427/5693/1751/files/36774755205.pdf
- https://cdn.shopify.com/s/files/1/0460/3576/3364/files/23609446256.pdf
- https://cdn.shopify.com/s/files/1/0438/7412/3944/files/practical_reliability_engineering_5th_edition.pdf
- https://static.usrfiles.com/ugd/dba42a_cc749ec4d6834c61b0b82ef13ab741b2.pdf
- https://static.usrfiles.com/ugd/ab922d_9d5aa3acddc14539903436349e2d7ce0.pdf
- https://static.usrfiles.com/ugd/63d3ad_b05a66390ca64a1283f783e6c066482a.pdf
- https://static.usrfiles.com/ugd/1e4819_f80f563bf21e49dd88cd5c8c17e25ac3.pdf
- https://static.usrfiles.com/ugd/b8c837_1f022ecf139f491995cd4ceceae10c07.pdf
- https://static.usrfiles.com/ugd/fbccce_9f64b9ecb98a4c32a7b6e5774e38c296.pdf
- https://static.usrfiles.com/ugd/76156b_1233b738525e4a97a80b63a86846644f.pdf
- https://static.usrfiles.com/ugd/b97cba_7ce99100646e45c69b9100468a2a936f.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_off000062fe.bin` `f3c285769d855b6c659696d0581cfc9926f8d93f73660178ed180c64d17c9894`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x62FE	5268 bytes
`font_01_sfnt_off00007512.bin` `48377aaaadfb230fb9c9ae1483d1ecd9f273e42d73d55653b2ef06410b21604b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7512	10324 bytes

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