PDF malware analysis — malicious · b55aaed5490351cc

MALICIOUS

PDF

38.6 KB Created: 2020-08-31 02:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f26b029a1b8505dc77c0916029ccffd4 SHA-1: a944aaf6ce6130a28a4579580ccd3291d608b455 SHA-256: b55aaed5490351cc6fc001c019ca80132ef94f859b42bdd0345530a7b75f6f7a

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits a PDF link farm heuristic, indicating a large number of outbound links, many hosted on 'cdn.shopify.com'. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and references to 'dolphin emulator mouse cursor', likely a lure.

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.com/wix?keyword=dolphin+emulator+mouse+cursor
- https://cdn.shopify.com/s/files/1/0431/3825/2957/files/norojivubigis.pdf
- https://cdn.shopify.com/s/files/1/0428/7463/4403/files/68277005202.pdf
- https://cdn.shopify.com/s/files/1/0434/5636/4711/files/dokirufesu.pdf
- https://cdn.shopify.com/s/files/1/0432/6562/2184/files/25486235682.pdf
- https://cdn.shopify.com/s/files/1/0430/1311/1961/files/statistical_arbitrage_machine_learning.pdf
- https://cdn.shopify.com/s/files/1/0429/5809/4495/files/26828749981.pdf
- https://cdn.shopify.com/s/files/1/0434/0521/3852/files/sebevurejomuwaxukas.pdf
- https://static.usrfiles.com/ugd/544c7e_088cfdfa6c8744c1bcb692049c8e6df5.pdf
- https://static.usrfiles.com/ugd/ea5d7b_60c4dce39f7b44ecb030ca64398bfb9a.pdf
- https://static.usrfiles.com/ugd/912de2_718dd9259b8d480abdcca20876d95edb.pdf
- https://cdn.shopify.com/s/files/1/0433/3584/3994/files/87581019845.pdf
- https://cdn.shopify.com/s/files/1/0432/2649/7182/files/11943428983.pdf
- https://cdn.shopify.com/s/files/1/0428/1312/8863/files/vojeke.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_off000057b3.bin` `282a74ba6e03ed7c6c3f427abd9d305f70d91e4a291ef66d5fdfa56f274dd93b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x57B3	5172 bytes
`font_01_sfnt_off00006914.bin` `2ff96e02b1d8a667551e3309653189513a220b0f7728f605d49960e83363f18a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6914	11032 bytes

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