PDF malware analysis — malicious · cefa241f86359041

MALICIOUS

PDF

78.2 KB Created: 2020-07-26 02:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: d0fe9d19ceff29a984706135e811d961 SHA-1: e8fc20d6503d542a7a96882fa905892a9e6cd738 SHA-256: cefa241f86359041eef680a727dc2bcdeaa2925d5177d0b8ad3298df7a7fe069

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'African union organs pdf'. The presence of numerous external links, including a link farm, indicates an attempt to distribute malicious content or engage in SEO-based phishing. The ML classifier 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.com/pify?keyword=african+union+organs+pdf
- http://files.susiphotography.com/uploads/1/3/0/9/130969939/5207696.pdf
- http://files.christiestimber.com/uploads/1/3/1/3/131380175/745348.pdf
- http://files.kingmanaussies.com/uploads/1/3/1/3/131379948/sudoga.pdf
- https://cdn.shopify.com/s/files/1/0431/5725/8395/files/44132236018.pdf
- https://cdn.shopify.com/s/files/1/0433/0595/9574/files/76972054357.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nagexonulelaxefirulilona.pdf
- https://cdn.shopify.com/s/files/1/0441/1519/8104/files/81724895692.pdf
- https://cdn.shopify.com/s/files/1/0428/2528/5798/files/21871610016.pdf
- https://cdn.shopify.com/s/files/1/0430/9814/4932/files/26311635076.pdf
- https://cdn.shopify.com/s/files/1/0430/1576/6177/files/dogenuzanevejurinaliled.pdf
- https://cdn.shopify.com/s/files/1/0433/2745/5387/files/36017090525.pdf
- https://cdn.shopify.com/s/files/1/0431/5637/3659/files/jirinuzomuwujebow.pdf
- https://cdn.shopify.com/s/files/1/0431/5417/8216/files/55183075.pdf
- https://cdn.shopify.com/s/files/1/0430/5531/7149/files/wakemezavaxi.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_off0000f897.bin` `fac963a5de50ccdbe66fcf149754cc603785b46ea7819664a51850cbc04e4cf4`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF897	4964 bytes
`font_01_sfnt_off0001096f.bin` `f588471ec9f277b783c8ce0f05c70ce74670d24278ed112e7a0a92b86d0575c9`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1096F	9992 bytes

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