PDF malware analysis — malicious · 8572d7ed30b07072

MALICIOUS

PDF

41.5 KB Created: 2020-08-29 13:38:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 38249f10394872ec2d620fd63f737a49 SHA-1: 00385515c851f71d9d0f6bb4551c800d906471e1 SHA-256: 8572d7ed30b07072e37bdb28845a4ae04d22a8c23afa9cb5564cc497de1cc799

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF SEO link farm, with numerous embedded links to other PDFs hosted on 'static.usrfiles.com'. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves leveraging these links for malicious redirection or SEO manipulation.

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=dnca+finance+annual+report
- https://static.usrfiles.com/ugd/b8c837_404c24a989354ec29ef1d2ea9a374377.pdf
- https://static.usrfiles.com/ugd/b8c837_1ee3cab2b60c4fbe80193b388bc05fd8.pdf
- https://static.usrfiles.com/ugd/b8c837_30133338fe614a2a8091094c329c4363.pdf
- https://static.usrfiles.com/ugd/b8c837_a2f540c36f1c48febaffc0d2ab13633a.pdf
- https://static.usrfiles.com/ugd/b8c837_735c6288f6dc435e9ebd8326560b260d.pdf
- https://static.usrfiles.com/ugd/b8c837_ad0a4e41112c4a19a55a6ec05c1513df.pdf
- https://static.usrfiles.com/ugd/b8c837_e6301040256f494fbeeebfdcdac7cf4c.pdf
- https://static.usrfiles.com/ugd/b8c837_58bfa08929de4765a34c6c8a5e712f61.pdf
- https://static.usrfiles.com/ugd/b8c837_b633df11384b4171b8969926aacb097b.pdf
- https://cdn.shopify.com/s/files/1/0437/8044/0213/files/answer_to_g_s_secret_mission.pdf
- https://cdn.shopify.com/s/files/1/0435/9582/5320/files/wild_animal_worksheets.pdf
- https://cdn.shopify.com/s/files/1/0435/8012/9441/files/10740685489.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_off00006594.bin` `4c5238f53cf69b174b93608a221d0b7e61f08ac4ff6906c36f99776fb5d0fd84`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6594	4832 bytes
`font_01_sfnt_off0000760b.bin` `9b8360095864f039f072a24a146939f347ffea5198de460857842a595683236e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x760B	10508 bytes

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