PDF malware analysis — malicious · 586b205ccf40f19e

MALICIOUS

PDF

34.9 KB Created: 2020-08-29 04:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 341dc877b73bb41f4fa86225a606656a SHA-1: 3947b0a33b45c67cbb09593c286c3f78fe0e5f78 SHA-256: 586b205ccf40f19e85e5ad278f322ef96374c72e3697364d882e10b199666700

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. The primary URL, https://ttraff.ru/wix?keyword=james+stewart+calculus+7th+edition+online, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to academic material, likely a lure. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/wix?keyword=james+stewart+calculus+7th+edition+online
- https://cdn.shopify.com/s/files/1/0429/0369/9615/files/lajuvulizebuji.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78030006053.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56802730071.pdf
- https://cdn.shopify.com/s/files/1/0428/4828/8935/files/diwivovi.pdf
- https://static.usrfiles.com/ugd/b8c837_8d82f48c52684b2cb2f4299c37467ed4.pdf
- https://static.usrfiles.com/ugd/b8c837_2a6ee4b485994e83a8f61d18f6b92ae3.pdf
- https://static.usrfiles.com/ugd/b8c837_65a89d287a984481afab65a9a83a6242.pdf
- https://static.usrfiles.com/ugd/b8c837_fbd1a2af1ae94595991240fcbf6f8176.pdf
- https://static.usrfiles.com/ugd/b8c837_b7567d631f994d1c92a30438b87d2f49.pdf
- https://static.usrfiles.com/ugd/b8c837_d5da69e4631440b58f7fcf8c8e94b7ee.pdf
- https://static.usrfiles.com/ugd/b8c837_9de4dfa3c6964f938a672be2f94dec18.pdf
- https://static.usrfiles.com/ugd/b8c837_3dac6d33d23745beac1c2bc26ccdf979.pdf
- https://static.usrfiles.com/ugd/b8c837_83e238e609754ece8cb303595b7fac41.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_off00004ad6.bin` `eb80cd8298b9e7611e60357f5f816887a35b1b5bed5e52addefd20a1b66e6b23`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4AD6	5340 bytes
`font_01_sfnt_off00005ce9.bin` `888d9938f0292269e88a7e4e2919783cac2f69c54eaa1c2b4cb2e9762a465d0e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5CE9	9864 bytes

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