PDF malware analysis — malicious · bf020827500c1954

MALICIOUS

PDF

47.3 KB Created: 2020-09-12 12:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: ca85781a04dff95d06bdf037f96db343 SHA-1: a1f5bd9795c11ba5043173baf4aa7436a525a1fc SHA-256: bf020827500c1954595c78f9eeb6f788d238bae1219cc8e88ac0103e939de95e

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of a link farm, likely for SEO manipulation or to distribute further malicious content.

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/pify?keyword=cyberghost+vpn+android+review
- https://cdn.shopify.com/s/files/1/0431/2888/1313/files/bioskop_keren_xyz_apk.pdf
- https://cdn.shopify.com/s/files/1/0438/2402/1664/files/gogaxotujaxinibi.pdf
- https://cdn.shopify.com/s/files/1/0479/3919/0951/files/glencoe_mcgraw_hill_world_history_worksheets_answers.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tanedikefiresemur.pdf
- https://cdn.shopify.com/s/files/1/0431/7023/4527/files/mifexixufa.pdf
- https://cdn.shopify.com/s/files/1/0464/5791/3512/files/enumerate_the_unconformities_of_sedimentary_rocks.pdf
- https://cdn.shopify.com/s/files/1/0429/6422/2101/files/tornillos_y_tuercas.pdf
- https://static.usrfiles.com/ugd/54fa57_e8e12cf7e77742a4b0ff437a5ba3ff00.pdf
- https://static.usrfiles.com/ugd/9c43ec_8825c202ea4347bfb6f0f25320f2333f.pdf
- https://static.usrfiles.com/ugd/55e2c6_65e0ec89a2f54118b7bb6526ce4b7505.pdf
- https://static.usrfiles.com/ugd/b8c837_870f38f1880f485db65ace1972aabca5.pdf
- https://static.usrfiles.com/ugd/bcb9fd_c452bd06c95643c58d7c355c40812e05.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_off000079e6.bin` `99b8bd13ac83ad0712993f9b76b218cb77027dc0aeac09a7cb96c8191e4b32eb`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x79E6	5488 bytes
`font_01_sfnt_off00008c9d.bin` `ccae128f542537d36e6c3be5ba0f6a4be4f02cce47f25e6ff7745779eae6b842`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8C9D	10580 bytes

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