PDF malware analysis — malicious · a76a925a3678f7e0

MALICIOUS

PDF

40.7 KB Created: 2020-08-29 23:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f0b086f7794ec57e60daf50af738b919 SHA-1: 410f58d972c8c33ae0200539ccbc1245c6136a26 SHA-256: a76a925a3678f7e09c35f24e7e372931a0fb4e3e752e592e62e907738212e34f

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, identified as a link farm. One of these links, https://ttraff.ru/wix?keyword=list+of+acidic+vs+alkaline+foods, points to known malicious redirector infrastructure. The document body is heavily obfuscated and contains the same URL, suggesting it is the primary lure. The ML classifier also strongly indicated maliciousness.

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=list+of+acidic+vs+alkaline+foods
- https://static.usrfiles.com/ugd/b8c837_d8405a7a87514521a8b6e3a1fa891439.pdf
- https://static.usrfiles.com/ugd/3b47cb_206f7b2c07ba44ab8f5ad4e1494691e7.pdf
- https://static.usrfiles.com/ugd/b8c837_41ac5ccd51e14f04a62e0b6039b684e1.pdf
- https://static.usrfiles.com/ugd/b8c837_f8f0a6fa93dd4babb76a95e8490c82dd.pdf
- https://cdn.shopify.com/s/files/1/0438/4302/7106/files/acer_drivers_for_windows_7.pdf
- https://cdn.shopify.com/s/files/1/0433/7840/9639/files/certificate_of_insurance_form_fs-_1.pdf
- https://static.usrfiles.com/ugd/b8c837_4890071b2bbf4314940612ace5b2b058.pdf
- https://static.usrfiles.com/ugd/b8c837_a81ace8223e44e36bc80f160beee2555.pdf
- https://static.usrfiles.com/ugd/b8c837_bc5f17f1c9a64ac3bf44c0439541038a.pdf
- https://static.usrfiles.com/ugd/3e5d97_ce845800845d4e7383bcbcdbd65671ec.pdf
- https://cdn.shopify.com/s/files/1/0431/5522/6773/files/piano_music_theory.pdf
- https://cdn.shopify.com/s/files/1/0432/7027/5237/files/12962528888.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_off00006276.bin` `d1dd010e62bb2ce8f7e51bc65d0ca2be5cb415f316cd60d6e47c8313258459b1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6276	4984 bytes
`font_01_sfnt_off00007383.bin` `27acc63913377bbc6f209f2f0dd4622b062d38b3253b4a8e7d96702e5e4b91e8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7383	10176 bytes

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