PDF malware analysis — malicious · 903e0a766a52622f

MALICIOUS

PDF

35.0 KB Created: 2020-08-01 22:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 3a0d71d06c76d587877e83ec77f6bb43 SHA-1: 837eb8d3df9a5e9d7221d51a4b24158fe121403f SHA-256: 903e0a766a52622f47b064dc20a01b20f195366904be2817aea1fbfb1fd6043d

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious redirector URL, suggesting the primary intent is to lure users to malicious sites. 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=alice+24%252F+7
- http://files.stephaniedonily.com/uploads/1/3/0/7/130775607/1377529.pdf
- http://files.chihdesignltd.com/uploads/1/3/2/8/132814241/roxajadotimijam_wosuzokubuwunux_gubixi.pdf
- http://files.lauradoering.com/uploads/1/3/2/8/132815220/zumif.pdf
- http://files.cs4il.org/uploads/1/3/0/9/130969003/sajaliwelil-lalurakeluje.pdf
- http://files.raphaelschwartzman.com/uploads/1/3/0/7/130775506/c079102.pdf
- https://cdn.shopify.com/s/files/1/0433/7870/4536/files/76940196239.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12729031526.pdf
- https://cdn.shopify.com/s/files/1/0438/4777/8469/files/71432318500.pdf
- https://cdn.shopify.com/s/files/1/0433/0258/4480/files/2180385605.pdf
- https://cdn.shopify.com/s/files/1/0437/1303/6439/files/sajovigagaweforaweroloruv.pdf
- https://cdn.shopify.com/s/files/1/0436/8711/6965/files/foveluroxuxifafukomipo.pdf
- https://cdn.shopify.com/s/files/1/0432/9639/1323/files/98894190628.pdf
- https://cdn.shopify.com/s/files/1/0433/9033/7189/files/86270563319.pdf
- https://cdn.shopify.com/s/files/1/0427/9861/2636/files/borugas.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_off00004d72.bin` `f9b6a1afbabe525c1c86d6527867db3781bb358eadfe3c526c8e5e81a46c2a25`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4D72	4636 bytes
`font_01_sfnt_off00005d6c.bin` `1c4f8841cc316f878d7ee6cf8581b7b3db12a4674c7c8c35df475645f8957560`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5D6C	10172 bytes

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