PDF malware analysis — malicious · c7159feb1af19910

MALICIOUS

PDF

41.4 KB Created: 2020-09-03 12:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: dfac0ea650b5c0126dda89b4c32bd805 SHA-1: d9fd098b9a1f46c4ce0dac41febbd36f89aba2b5 SHA-256: c7159feb1af19910095b51dad062391bf84388e8a6f892d1cbeda80487cf8663

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.me/wix?keyword=video+er+ad+free+apk'. This URL is presented within the document body, suggesting a social engineering lure. The presence of numerous other PDF links also indicates a link farm strategy, likely to obscure the malicious destination. 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.me/wix?keyword=video+er+ad+free+apk
- https://static.usrfiles.com/ugd/4b874d_64fb29ffea7c403db907dfd06c4cd16d.pdf
- https://static.usrfiles.com/ugd/b914b5_c2ec854c87c64baea9ddd90839d2fdab.pdf
- https://static.usrfiles.com/ugd/a474dd_6e81820de926472e90ddc7a4452b70de.pdf
- https://static.usrfiles.com/ugd/2f7815_551011554953438aae42eb878cb70920.pdf
- https://cdn.shopify.com/s/files/1/0433/3119/0952/files/75537148639.pdf
- https://cdn.shopify.com/s/files/1/0462/6451/6757/files/freepik_template_ppt.pdf
- https://static.usrfiles.com/ugd/e33828_c41d736f62534b67a0333be7df61197b.pdf
- https://static.usrfiles.com/ugd/b8c837_aa38c9f0a4c34d9d8bcd5b10748a485c.pdf
- https://cdn.shopify.com/s/files/1/0459/1462/0053/files/draw_sheet_plastic_90_x_180cm.pdf
- https://cdn.shopify.com/s/files/1/0434/4155/3575/files/66232585122.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000056db.bin` `b19def01257361673906acd9d6496f91509aa0e31ad1c2f5e307e19ae8148157`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x56DB	4856 bytes
`font_01_sfnt_off0000676e.bin` `f29791c577fb8efd97a4133c5aa60f7028e8039184fbef8522f7a35ca0b46ea9`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x676E	2012 bytes
`font_02_sfnt_off000070a4.bin` `ce68a09045f11657c940d9b049bdf7f73c237215e2098e5b0d34ba74d77a6c1e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x70A4	14796 bytes

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