PDF malware analysis — malicious · 609dbd4d346bdf82

MALICIOUS

PDF

41.1 KB Created: 2020-09-01 00:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 93213fe17b1760c2a0ae0c4b99bee5aa SHA-1: 90b973c22f93590e244fe7af80fc7b8f1ce55a23 SHA-256: 609dbd4d346bdf82ebdbc3a706a6ae2797c180742d85df73293dbf970f3caf28

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to a 'sample loan agreement form' to entice users to click the malicious link. The presence of a large number of external PDF links, many pointing to seemingly benign content, suggests a link farm or SEO manipulation tactic to obscure the malicious intent.

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.ru/wix?keyword=sample+loan+agreement+form
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/b8c837_ec46b9046ca94cfe850ab314226bdc4f.pdf
- https://static.usrfiles.com/ugd/51c472_6e87aeafe0ab4c44a50989bbe36ec939.pdf
- https://static.usrfiles.com/ugd/ecec20_89ca553be32e47dc83c73236a08890be.pdf
- https://static.usrfiles.com/ugd/2274a7_56abaf6058254cdca2dd28b0e9c97338.pdf
- https://static.usrfiles.com/ugd/29c71c_698f96d4296040ccbe4819a280e242cf.pdf
- https://static.usrfiles.com/ugd/9e53d4_84032e22609243609c2a8e90ef345bf2.pdf
- https://static.usrfiles.com/ugd/314c35_12fd9f6429614e918f6e67c7161b1ee0.pdf
- https://cdn.shopify.com/s/files/1/0436/5107/2158/files/bickerstaff_neurological_examination_free_download.pdf
- https://cdn.shopify.com/s/files/1/0430/5892/1621/files/vokotajenimadifukuxipuge.pdf
- https://cdn.shopify.com/s/files/1/0437/1572/3416/files/all_cheats_of_gta_vice_city.pdf
- https://cdn.shopify.com/s/files/1/0431/1810/0637/files/hunger_games_book_series_pdf.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/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000062c6.bin` `d1b53d0950fc23e4d4cc04046916cd14dbfa492ccef12103a29223a634abba7f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x62C6	5144 bytes
`font_01_sfnt_off00007433.bin` `0628e549f0dc57e29b1acace1e1cb4807f0e1c2414e2b7b93c85500e7757fcde`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7433	10472 bytes

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