PDF malware analysis — malicious · b55a034493b76f7e

MALICIOUS

PDF

41.4 KB Created: 2020-08-31 23:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: e6444f3d6b24e1f0ab3fe1266a4a0f37 SHA-1: 73b9feff32e60d955a42c9ca402e19dd2c51dd3d SHA-256: b55a034493b76f7ec0e627c0594c2fbfc628581528cdd6713718dc841d0a6c46

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links, with one critical heuristic identifying a malicious redirector. The document body, though partially corrupted, contains text related to 'lease liabilities' and includes the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of multiple links to external PDFs, some benign and some potentially malicious, indicates a link farm strategy. No scripts were extracted from this sample.

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/pify?keyword=lease+liabilities+on+balance+sheet+ifrs+16
- https://static.usrfiles.com/ugd/b13fd1_8443414aded249a198f4313cd7eadcd0.pdf
- https://static.usrfiles.com/ugd/b8c837_6da0e753bd2a4a4aaa283a4db41a30f6.pdf
- https://static.usrfiles.com/ugd/b8c837_9f19f3f709c24505b265ac7d5dbada1b.pdf
- https://static.usrfiles.com/ugd/b8c837_5e3f30dc7ec04e13856d12694b8d1fbd.pdf
- https://cdn.shopify.com/s/files/1/0431/6263/2360/files/vocabulary_activities_for_high_school.pdf
- https://static.usrfiles.com/ugd/b8c837_72115776a4274be4a9a49a3aebd463b9.pdf
- https://static.usrfiles.com/ugd/b8c837_c93680be0c0b429e94243db76bad95db.pdf
- https://static.usrfiles.com/ugd/b8c837_54acd1b4359e40bab030e4b644c34145.pdf
- https://cdn.shopify.com/s/files/1/0437/8545/3730/files/lazonubosipimowikar.pdf
- https://cdn.shopify.com/s/files/1/0436/8554/4089/files/93524449480.pdf
- https://cdn.shopify.com/s/files/1/0432/7702/5446/files/eenadu_epaper_today_telangana_download.pdf
- https://cdn.shopify.com/s/files/1/0437/8561/7570/files/bivegaposaxin.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_off0000646f.bin` `252973b85a70fb00ec6e2cd042c1a83620ad99ad1605d5a2fd347b444777ce8c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x646F	5256 bytes
`font_01_sfnt_off00007651.bin` `4ac4e1bf72e8f9fd6824df0c68cfd2238cc4fad93675f8fc2eefb349e22bf84b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7651	10136 bytes

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