PDF malware analysis — malicious · 457fdab6464a05a3

MALICIOUS

PDF

37.2 KB Created: 2020-08-30 02:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 169b4cb07f7d5eba51354ce2354f160c SHA-1: 6b0cae228a5b16a441e253586770d260aa7c6639 SHA-256: 457fdab6464a05a3c95e788b931422adcf3abfff9f2da193d8fad6504374977f

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=overloud+th2+free+download'. This indicates the document's primary purpose is to redirect users to potentially harmful content. The presence of a large number of external PDF links, many hosted on 'static.usrfiles.com', further supports a link-farming or redirection-based attack. The ML classifier also 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.cc/wix?keyword=overloud+th2+free+download
- https://static.usrfiles.com/ugd/5bb01c_61f8b35341174f6988e8710297bf6ba6.pdf
- https://static.usrfiles.com/ugd/73c254_d96a939f09ab4016ae3d78b8381b94a0.pdf
- https://static.usrfiles.com/ugd/b8c837_aeaf9351dc864d9ab8b581dbf4d5106f.pdf
- https://static.usrfiles.com/ugd/4c1554_7f556b25a10442128656e453051ac3ca.pdf
- https://cdn.shopify.com/s/files/1/0431/2468/7014/files/usa_holidays_calendar_2016.pdf
- https://cdn.shopify.com/s/files/1/0435/8488/0798/files/james_sheets_evansport_ohio.pdf
- https://cdn.shopify.com/s/files/1/0436/9268/7513/files/barthel_index_2020.pdf
- https://cdn.shopify.com/s/files/1/0438/6275/3445/files/dodakepodaketefewelezebid.pdf
- https://cdn.shopify.com/s/files/1/0435/7668/8799/files/33143661071.pdf
- https://static.usrfiles.com/ugd/67e251_b72d7342d81346d3b54fe44abd056c7e.pdf
- https://static.usrfiles.com/ugd/4ae4db_3328dad468bc4b2dae1d4a1d61054e38.pdf
- https://static.usrfiles.com/ugd/362633_85a23dbc8ba74af2965a608d09691173.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_off000051af.bin` `97a2cc26f43081b1fa40656f903a771ab25bd2e29100c02f9825f37f13e101bd`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x51AF	5128 bytes
`font_01_sfnt_off00006333.bin` `f80215df5113102c64a5a9b8906cb9bbf6293eeba0dc546913dfb0a92548cb03`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6333	10916 bytes

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