PDF malware analysis — malicious · 9bdfb623dd081ed1

MALICIOUS

PDF

33.7 KB Created: 2020-09-11 16:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: eafcd1b02acd580b73ee05cad5d0bbb8 SHA-1: 01a52d450762ecf5198f0d63eb03fde96c7ae1cc SHA-256: 9bdfb623dd081ed1e856dcb79d76eb71c7b69fc4319393a7b31c69072b6f01f6

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.link/wix?keyword=unlv+hospitality+management+degree+sheet'. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on static.usrfiles.com, suggesting a link farm or redirection strategy. 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.link/wix?keyword=unlv+hospitality+management+degree+sheet
- https://static.usrfiles.com/ugd/4dbf3f_845e9f5d809440ae93364e0f599e748e.pdf
- https://static.usrfiles.com/ugd/74147a_27b0321bd6fb4d2a85dd53b1f246cf71.pdf
- https://static.usrfiles.com/ugd/3bca44_68fd44004c7d4873a5fa0c7a788381b7.pdf
- https://static.usrfiles.com/ugd/3aee12_20ca6c6db9364dfba393cfd8052b9150.pdf
- https://cdn.shopify.com/s/files/1/0430/4211/1650/files/venuvutazusiwamiko.pdf
- https://cdn.shopify.com/s/files/1/0430/7301/1863/files/7029372376.pdf
- https://cdn.shopify.com/s/files/1/0434/8693/7253/files/pojufojunivazer.pdf
- https://cdn.shopify.com/s/files/1/0431/1734/6976/files/cancer_esofago.pdf
- https://cdn.shopify.com/s/files/1/0428/6133/0598/files/outback_nutrition.pdf
- https://cdn.shopify.com/s/files/1/0431/8373/4943/files/educational_research_quantitative_qualitative_and_mixed_approaches_free.pdf
- https://static.usrfiles.com/ugd/2e79a6_e4f51f4d81554f2f9a0eedc312439a91.pdf
- https://static.usrfiles.com/ugd/cc15ef_dfb216ace5044200a0bbc8ac4f865ac3.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_off0000470f.bin` `4496d20d610fe503af5c6e60ac05a69b4671cf7c800cf0162772c5566c8f7fe7`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x470F	5524 bytes
`font_01_sfnt_off000059bc.bin` `a9b424e6ca53f6968ed416a30f5368f68cfc97489c1dc036088deadd57e8cf34`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x59BC	9492 bytes

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