PDF malware analysis — malicious · 562f041ba8597e47

MALICIOUS

PDF

34.9 KB Created: 2020-08-29 17:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 301e4201e59e48186c0d6d92d26886cd SHA-1: a9a78304f482323ac12a6b85c9186c4b7a6a2f68 SHA-256: 562f041ba8597e47f9c676d087473aeb65f8bf5029534e48d4dd75900251021b

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same URL found in the heuristic. This suggests the primary purpose is to redirect the user to a malicious site. The ML classifier also strongly flagged this PDF as malicious.

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=hagure+yuusha+n%25C3%25A3o+estetica+12
- https://static.usrfiles.com/ugd/b8c837_bda09e0073e64be0915736abccfd8be7.pdf
- https://static.usrfiles.com/ugd/b8c837_c6e0b31c7e204237a0f3c7d6860efbc7.pdf
- https://static.usrfiles.com/ugd/d78803_e988b393dcdd4935aafbf1ce961d2944.pdf
- https://static.usrfiles.com/ugd/b8c837_5e8e1677c4d24c3b96da265f62ba50d6.pdf
- https://static.usrfiles.com/ugd/ac72e0_bbc29ed4f76346719df49c582744e649.pdf
- https://static.usrfiles.com/ugd/b8c837_e0de796fada64556b4cb00baf59f5ec7.pdf
- https://static.usrfiles.com/ugd/b8c837_bfa3c3610ba742a2be88244e439d246f.pdf
- https://cdn.shopify.com/s/files/1/0428/6034/7551/files/9694354610.pdf
- https://cdn.shopify.com/s/files/1/0437/4495/2471/files/62982282980.pdf
- https://cdn.shopify.com/s/files/1/0434/0423/0805/files/jcr_journal_citation_reports_impact_factor.pdf
- https://cdn.shopify.com/s/files/1/0432/6214/8763/files/37438458702.pdf
- https://cdn.shopify.com/s/files/1/0438/1802/5122/files/fire_genasi_5e.pdf
- https://cdn.shopify.com/s/files/1/0438/3752/2085/files/kutcher_adolescent_depression_scale.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_off0000410f.bin` `fea7ccb56feb5b4d304aa0705977a80ff7e9be7a1a5d2a4233867115ab6202d7`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x410F	5596 bytes
`font_01_sfnt_off00005387.bin` `30b1959c97094a235626f366ce4860a41d3c3ade3e5a8af1716956d48aac44f8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5387	13452 bytes

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