PDF malware analysis — malicious · c0bcb2d8bcb5ef65

MALICIOUS

PDF

38.6 KB Created: 2020-08-30 05:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 34f1acb37c477d36687778a4e4b58d6e SHA-1: f1b889001b347bc542303676678d82f8b27173fb SHA-256: c0bcb2d8bcb5ef65390490084d1e5e001d0b62a122d8f1a93e26c50a0f09abd9

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=verb+to+be+simple+present+worksheet'. Additionally, it exhibits a PDF link farm behavior, with numerous external PDF links, many hosted on 'static.usrfiles.com'. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector and link farm indicates a likely phishing or malware distribution attempt.

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.cc/wix?keyword=verb+to+be+simple+present+worksheet
- https://cdn.shopify.com/s/files/1/0428/1778/1927/files/duxorarejumol.pdf
- https://cdn.shopify.com/s/files/1/0434/7022/5574/files/calidad_de_vida_tesis.pdf
- https://cdn.shopify.com/s/files/1/0437/9040/1685/files/2014_camaro_zl1_performance_specs.pdf
- https://static.usrfiles.com/ugd/b8c837_57ec894ce3114311ba8ef79cd7a159b3.pdf
- https://static.usrfiles.com/ugd/b11f6d_563c59b560ee449cbfb45df0bd1d0343.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39738284996.pdf
- https://cdn.shopify.com/s/files/1/0427/4959/1718/files/vaforuka.pdf
- https://static.usrfiles.com/ugd/b8c837_173c99e94a0640a4accc19156c7143b8.pdf
- https://static.usrfiles.com/ugd/67e251_a98ce25b1ee7463ea37be96a9cae7abc.pdf
- https://static.usrfiles.com/ugd/b58d21_328b825b453742dba612a273c158b2b0.pdf
- https://static.usrfiles.com/ugd/cbe7f7_b516b00987184c8ea9f88a763a5acfed.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_off00005989.bin` `01dc6414fa79e4b2cd5aebc39fb616cce90ec2d24be44490b25af46052314828`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5989	5108 bytes
`font_01_sfnt_off00006aca.bin` `0cf431ee0485eb9d3e5a85fda624a1a3f7f589d9e9b11c217589fd7a8455496c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6ACA	10344 bytes

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