PDF malware analysis — malicious · 913c4b22323a5ce2

MALICIOUS

PDF

45.0 KB Created: 2020-09-01 14:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: db1564f19cab4c7fb7b114f5ff35db0c SHA-1: a3f42b5088aeab88916cc4cc6368355f74a61639 SHA-256: 913c4b22323a5ce2eec1fd42f2d9b712bd5213b2d0fb8827724252da37cf6c46

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a critical heuristic for linking to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, containing numerous external links. The document body contains seemingly unrelated text and metadata, suggesting it is primarily a container for malicious links rather than informative content. The primary malicious IOC is the redirector URL.

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/pify?keyword=chakram+malayalam+movie+theme+music
- https://static.usrfiles.com/ugd/b8c837_21791645619e4342be4c9148618b81a8.pdf
- https://static.usrfiles.com/ugd/b8c837_cc22890e19354a8c95a814f9dc2f3ac0.pdf
- https://static.usrfiles.com/ugd/3aee12_3e4aaa931c1a45808db53cc0364d9fe8.pdf
- https://static.usrfiles.com/ugd/b8c837_b65901dd59a241eaa4aa068040591833.pdf
- https://cdn.shopify.com/s/files/1/0431/3815/4650/files/22683864827.pdf
- https://cdn.shopify.com/s/files/1/0431/6105/9482/files/vimasib.pdf
- https://cdn.shopify.com/s/files/1/0437/2293/2373/files/fawavomenubasoge.pdf
- https://cdn.shopify.com/s/files/1/0439/0407/3883/files/72338982025.pdf
- https://cdn.shopify.com/s/files/1/0437/8073/5138/files/jitobisipukivoxizokiko.pdf
- https://cdn.shopify.com/s/files/1/0437/2119/5688/files/tifutuza.pdf
- https://cdn.shopify.com/s/files/1/0438/0744/1053/files/58830579255.pdf
- https://cdn.shopify.com/s/files/1/0430/8742/9785/files/fraud_waste_and_abuse_reporting.pdf
- https://cdn.shopify.com/s/files/1/0433/9856/1957/files/factors_influencing_academic_performance_of_students.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_off00006fae.bin` `7617ecae890f164be7d77aea804ff0832e8ec0e0e2185e9bdc5cab19e7a424f3`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6FAE	5168 bytes
`font_01_sfnt_off0000811f.bin` `d606432cfbb0f3d79f889cba8e4af8c4db40d34d34e84131bfbee229e823aa48`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x811F	11516 bytes

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