PDF malware analysis — malicious · c448f18964af524f

MALICIOUS

PDF

51.6 KB Created: 2020-08-31 07:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 248ff4d3ed7a19e0c816164140b26336 SHA-1: 3f7fafbac0f8f5b3b3f1e236e573ea7e527eab5f SHA-256: c448f18964af524f8a82ffb4d93d7a1d12ae1c72dffa759c0a6f4a314382c179

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded links, many of which point to static.usrfiles.com, but one critical link redirects to ttraff.com, which is flagged as malicious. This indicates the document is designed as a link farm to distribute malicious content. The ML classifier strongly supports this assessment.

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.com/wix?keyword=ejercicios+interactivos+de+coherencia+y+cohesion
- https://static.usrfiles.com/ugd/3e87bf_de7e340efc004f7fa171edacab47154d.pdf
- https://static.usrfiles.com/ugd/b8c837_57ce9fba7b8f487da62bb35dc16ce0a2.pdf
- https://static.usrfiles.com/ugd/ade4e6_de89ecef896e4eaf99de7924d0fa1a83.pdf
- https://static.usrfiles.com/ugd/b8c837_f68ba551c4664203a2ecacec1817c8da.pdf
- https://static.usrfiles.com/ugd/3826db_055b62e97b864dc4b3e8e93e990de87b.pdf
- https://static.usrfiles.com/ugd/b8c837_88d61fd07bf1437c88f4d5ed8bd4f251.pdf
- https://static.usrfiles.com/ugd/fd3290_6bd7eb83b7dc40dda7cf67963bbe842b.pdf
- https://static.usrfiles.com/ugd/735189_108d1b0c346c46dbb22944f207354159.pdf
- https://static.usrfiles.com/ugd/b8c837_af3fb698941c4120bcebc329ca68dcf0.pdf
- https://static.usrfiles.com/ugd/197ed4_310efd4e59a84b60a392a29988b1c398.pdf
- https://static.usrfiles.com/ugd/b8c837_91508e7358304576842ae55e365186eb.pdf
- https://cdn.shopify.com/s/files/1/0433/3699/0885/files/vetekewale.pdf
- https://cdn.shopify.com/s/files/1/0431/5961/7690/files/python_programming_for_hackers_and_p.pdf
- https://cdn.shopify.com/s/files/1/0431/7921/2959/files/16863901560.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_off0000895b.bin` `05db69700de53a916fad2dcd30a4547d2a77576b12157148d72d33d42bcc6155`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x895B	5188 bytes
`font_01_sfnt_off00009b05.bin` `622a4b3654177071594e622d08fdab55b2eb2554f1fe4880aa76709bbb17ab84`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9B05	11348 bytes

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