PDF malware analysis — malicious · 50dedf553b721e48

MALICIOUS

PDF

33.3 KB Created: 2020-09-05 03:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: d0ed438f4937839e89e63b940ef93336 SHA-1: a341a60e3958198f7fe8b791a6d0aaec90fc2e57 SHA-256: 50dedf553b721e486798e6fa8a2786cc9e37f72152bdfef6efe1d1f7015f9bb0

152 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains a link to a known malicious redirector infrastructure, specifically `https://ttraff.club/wix?keyword=classical+conditioning+phobias+worksheet`. This heuristic, combined with the PDF's structure containing a link farm pointing to external PDFs, strongly suggests a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

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.club/wix?keyword=classical+conditioning+phobias+worksheet
- https://static.usrfiles.com/ugd/ab059d_5d2af3d52c0a408ea1376c0985e3e881.pdf
- https://static.usrfiles.com/ugd/b8c837_5682ad6c1e824fad9ebf8d3a9c35d490.pdf
- https://static.usrfiles.com/ugd/7c3584_2f57d603b49241f396870546cf582839.pdf
- https://static.usrfiles.com/ugd/d4a9d6_2310ab1562d8406e985a6a7faaa7fe6a.pdf
- https://static.usrfiles.com/ugd/9a242c_9e184c84fc52466ca1cc953d5143e1c8.pdf
- https://cdn.shopify.com/s/files/1/0436/1607/5939/files/tamil_songs_website.pdf
- https://cdn.shopify.com/s/files/1/0434/5459/5224/files/mowekufemitagawuwafa.pdf
- https://cdn.shopify.com/s/files/1/0435/5745/3985/files/ashlar_masonry.pdf
- https://cdn.shopify.com/s/files/1/0451/0603/6899/files/cambridge_fce_practice_test.pdf
- https://static.usrfiles.com/ugd/b8c837_f08824529f9b4738bcc0c7db2681c5c1.pdf
- https://static.usrfiles.com/ugd/3a38e0_667e4d43119445078505c8f405354dda.pdf
- https://cdn.shopify.com/s/files/1/0433/9941/3925/files/kuwixokixetamewamavuso.pdf
- https://cdn.shopify.com/s/files/1/0437/1460/9303/files/busizofibisotab.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_off000044f5.bin` `c50a56cdb2e1fdf2a6b233690f25f67bd11922da6a8d462318790bfa3a301a65`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x44F5	5536 bytes
`font_01_sfnt_off000057c5.bin` `887c91273e111314bb120476fb9d439086181b2eb6325988f172bcbea34bd71a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x57C5	9488 bytes

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