PDF malware analysis — malicious · 87a7d378fa691e47

MALICIOUS

PDF

36.0 KB Created: 2020-09-03 05:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: ba5aa90adf92304c42193151a88b5f62 SHA-1: 7e879a5f1674765dd8446ab521be55d32e224e4b SHA-256: 87a7d378fa691e4772049684170b3d53e3a299c95973acff26e6069dd903c5c5

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, includes a URL that appears to be a lure for free PDF downloads, suggesting a tactic to manipulate search engine results or redirect users to potentially harmful sites. 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.me/pify?keyword=tuttle+learning+chinese+characters+pdf+free
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/b8c837_57da1a70ffb54bcdb5b94610ada5d0ce.pdf
- https://static.usrfiles.com/ugd/3f4b99_e61fd1c04abb43a493fac4f8f365c29e.pdf
- https://static.usrfiles.com/ugd/b8c837_017a50ce0dae4a9c81b46eaa0092e1b2.pdf
- https://static.usrfiles.com/ugd/682d1c_36d8952b5a9744fdbfea422fef0dba05.pdf
- https://static.usrfiles.com/ugd/5bb01c_486827e06f8c4f3f83cda937f6e486b7.pdf
- https://static.usrfiles.com/ugd/345929_55b8e8d0db1d427493f4713bf90117de.pdf
- https://cdn.shopify.com/s/files/1/0433/8126/0438/files/dutalaboxativarobugisep.pdf
- https://cdn.shopify.com/s/files/1/0432/1663/4016/files/jibivinakabamuda.pdf
- https://cdn.shopify.com/s/files/1/0434/0147/8300/files/xulotojebuxiwebefet.pdf
- https://cdn.shopify.com/s/files/1/0429/4295/5676/files/rutherford_zip_code.pdf
- https://cdn.shopify.com/s/files/1/0433/6313/9733/files/17825390403.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/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00004f30.bin` `fb4bc47f9be78e81c16edfa3014dda228fba715e47fe21149c1b044c9075b797`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4F30	5368 bytes
`font_01_sfnt_off00006169.bin` `dd5730ef10aa425c05b3ebc97568d6260509a45b69f370b8414e6c36f389d6de`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6169	9896 bytes

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