PDF malware analysis — malicious · c93445b67003c3cd

MALICIOUS

PDF

39.9 KB Created: 2020-09-02 22:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 1493f976be297a0c49bb3a20b5c2716c SHA-1: b32d5d9f05fa8c00b025c01c04509159f4dc3968 SHA-256: c93445b67003c3cde22e69f401967c9d9d0f14e3804f6751eb0a21917e52f9f3

152 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=mathematical+crossword+puzzle+answer'. This URL is likely part of a phishing or malware distribution chain. The document also exhibits characteristics of a PDF link farm, with numerous external links, many pointing to static.usrfiles.com. The ML classifier strongly flagged this PDF as malicious. 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/wix?keyword=mathematical+crossword+puzzle+answer
- https://static.usrfiles.com/ugd/b8c837_89ad23fa5c5d4c0ca8e745aeb109c8d4.pdf
- https://static.usrfiles.com/ugd/b8c837_d5fc71bab1c54a5db60c1976060763a3.pdf
- https://static.usrfiles.com/ugd/3bcfef_2aae78c8561c486a86107ed3a689e2e1.pdf
- https://cdn.shopify.com/s/files/1/0429/2709/5967/files/hundreds_tens_and_units_free_worksheets.pdf
- https://static.usrfiles.com/ugd/30ea26_a35017e00ee842f89c641f0cb02fc93b.pdf
- https://static.usrfiles.com/ugd/516793_bcd50f7223f44b4c81ffd3a01567b668.pdf
- https://static.usrfiles.com/ugd/b8c837_72047fc3f4ea457f8ebb4da76410827a.pdf
- https://static.usrfiles.com/ugd/b8c837_bfc436c1bdf3466e97a9b31015e219f8.pdf
- https://static.usrfiles.com/ugd/29c71c_f799c71ece8e4501b2956d2d349ba5b7.pdf
- https://static.usrfiles.com/ugd/33ab24_964e3d2171e5494ab83640ea7c059e5a.pdf
- https://static.usrfiles.com/ugd/b8c837_4493e59051774c8fa2fe4a3c12387574.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_off00005e0e.bin` `6c9fff946a11099e53f2491f273b5fe4385691963467f805ec4d96ebc645e616`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5E0E	5460 bytes
`font_01_sfnt_off00007097.bin` `96bc50847a770800216cea9c896a3a5bf72504db6b7603cfee368834ade70fa1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7097	10088 bytes

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