PDF malware analysis — malicious · 19a4a32f6f64fa9c

MALICIOUS

PDF

80.0 KB Created: 2020-09-03 02:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: a4a08fe4ae9ecb19a0cf4b2b3acd85b7 SHA-1: 2b01412c3e64e168c02c08fe608e2f63027d4183 SHA-256: 19a4a32f6f64fa9c2b6ea9aee7ba73e391634b2a24668cdcee2ce4c9cc79df77

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm designed to attract traffic. The ML classifier also strongly flagged this PDF as malicious. The embedded URL points to a redirector that likely serves malicious content or leads to further compromise.

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.com/wix?keyword=financial+ratio+analysis+template+excel
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/277b62_cb6e3fc41c4c43ca8a4bb13791254029.pdf
- https://static.usrfiles.com/ugd/46429b_ed334d4e0a52440b914f6248aac79e64.pdf
- https://static.usrfiles.com/ugd/0d2fda_892d7db9033e49d9a7fc1c2949730852.pdf
- https://cdn.shopify.com/s/files/1/0429/8627/4977/files/dexuvivogebedowe.pdf
- https://cdn.shopify.com/s/files/1/0427/9628/6111/files/buwujegagutile.pdf
- https://cdn.shopify.com/s/files/1/0432/3108/4708/files/tupiwag.pdf
- https://cdn.shopify.com/s/files/1/0428/3485/4051/files/l_anatomie_de_l_oreille.pdf
- https://cdn.shopify.com/s/files/1/0430/4342/2359/files/brother_printer_driver_hl_1201.pdf
- https://cdn.shopify.com/s/files/1/0434/6265/6165/files/77948035174.pdf
- https://cdn.shopify.com/s/files/1/0435/8812/4831/files/handwriting_tracing_sheets_alphabet.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/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fc35.bin` `cb40c9abb214e2e23a16292f0101ce3ab96382e8078bcb728a45de44141b2429`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC35	5204 bytes
`font_01_sfnt_off00010de1.bin` `4b90ca18ad39391871c3e1eff0d7d84f1b7aa42cee5c3325ffe00b7cc87afd27`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DE1	11124 bytes

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