PDF malware analysis — malicious · bfa6cfe2a759aca7

MALICIOUS

PDF

42.2 KB Created: 2020-09-02 18:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 0ad915bf314f2eca126e4e684a46ee1e SHA-1: 3dfc861bb3400bf462ecb8bf96ad60b713b001a9 SHA-256: bfa6cfe2a759aca7749e628000609ef805910b2b91147e091eb2329e5566486a

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains numerous embedded links, including a critical redirector link to 'https://ttraff.link/wix?keyword=alliancebernstein+mutual+funds+performance'. The document body, though heavily obfuscated, contains keywords related to mutual funds, suggesting a lure for phishing or to direct users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports 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.link/wix?keyword=alliancebernstein+mutual+funds+performance
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27360052690.pdf
- https://cdn.shopify.com/s/files/1/0431/7685/3664/files/91904154068.pdf
- https://cdn.shopify.com/s/files/1/0431/6191/1458/files/subolewufasukevofeb.pdf
- https://cdn.shopify.com/s/files/1/0464/1344/7336/files/assam_university_forms.pdf
- https://static.usrfiles.com/ugd/73c254_5c74add64c11428994179787fd0f9075.pdf
- https://static.usrfiles.com/ugd/74e905_b3c707b85ac847bbb19b406d976280c2.pdf
- https://static.usrfiles.com/ugd/47b1e8_ea84f38e94014999b3e0315f65cbab2e.pdf
- https://static.usrfiles.com/ugd/74e905_fb881729c564482db1e26ded2f9fef79.pdf
- https://cdn.shopify.com/s/files/1/0435/1927/9258/files/manujonoxeruwix.pdf
- https://cdn.shopify.com/s/files/1/0437/9174/5175/files/86775906641.pdf
- https://static.usrfiles.com/ugd/455f95_3dacabb59a874b1086a79aa4289041c1.pdf
- https://static.usrfiles.com/ugd/93c935_5f4d27f1e99a4513a7092793a9289478.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_off0000665a.bin` `aa17629e49cbb1a87cb5dc76116827b0c2b8232c4d826e88c2cfa3f83e4afb1b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x665A	5432 bytes
`font_01_sfnt_off000078b5.bin` `cc367a0be6b211f8ca3ae8330024839ac24723bfa6b23d770e3f6326a945b4d5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x78B5	10392 bytes

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