PDF malware analysis — malicious · 4dbb31caf25d5da6

MALICIOUS

PDF

43.5 KB Created: 2020-09-02 16:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: bc79e5a583ed93f8933a7fa28c1d252a SHA-1: e93c5b381b8da5c46dd0e3c87749fd6a7c10f076 SHA-256: 4dbb31caf25d5da69da8bc7cfb85d6f5f7a7489484c100ba73c9d92e7e352fe8

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/wix?keyword=instagram+template+free+2018, which is likely used to redirect users to malicious content. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded links pointing to external PDF files, suggesting an attempt to manipulate search engine results.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 3

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.
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.ru/wix?keyword=instagram+template+free+2018
- https://static.usrfiles.com/ugd/23e9be_b13ff0802dd64fb4b2d237502343faa5.pdf
- https://static.usrfiles.com/ugd/10e3af_424fc344f45b4ad69c555ffa0a0b0a8c.pdf
- https://static.usrfiles.com/ugd/3de8a6_e2b981cdf1af4405a6baea691a085d96.pdf
- https://static.usrfiles.com/ugd/238140_95fa93872e514e1a86a1cd09b28acebe.pdf
- https://static.usrfiles.com/ugd/e73fea_cb778b79e4c64510b9db559f36d474b3.pdf
- https://cdn.shopify.com/s/files/1/0436/9396/5466/files/addition_worksheets_for_kinder.pdf
- https://cdn.shopify.com/s/files/1/0466/3200/9893/files/nord_vpn_cracked_apk_android.pdf
- https://static.usrfiles.com/ugd/7f46b5_0095a46e647b4c089258f647233338d9.pdf
- https://static.usrfiles.com/ugd/4b874d_9f876c0384104e96a05bb870f611f0e9.pdf
- https://static.usrfiles.com/ugd/b8c837_03c10706f4274681a2791097c196dca5.pdf
- https://static.usrfiles.com/ugd/c63dba_6e41cf3a70a444fb87bc5c7cb275adb4.pdf
- https://static.usrfiles.com/ugd/cafc24_c917435da31c42ff8ffe9dd611fcbbe9.pdf
- https://static.usrfiles.com/ugd/7ff653_294401f4466b42f1a1ca69a01b4ce78c.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_off00006b0e.bin` `1c35c979d6c22a835520d046052f55d6ff314441c197b4c93ed582a346d5fd86`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6B0E	5680 bytes
`font_01_sfnt_off00007e4e.bin` `da51e88f379c943f83f9388f3bbe8175c2a691310ae159fa1e261f3a209aa345`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7E4E	10328 bytes

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