PDF malware analysis — malicious · 039041ca12f4308e

MALICIOUS

PDF

43.2 KB Created: 2020-09-01 03:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: b80c703e19b01b556716f3e2800a5c81 SHA-1: 8a688ed0e1e0c37f0c290abd7e697d571b6fafdf SHA-256: 039041ca12f4308eebd00dd5d5808eeddf844943e0c39786cc5094520c929775

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=centering+sheet+images'. The document body, though heavily obfuscated, also contains this URL. The presence of a large number of external PDF links, many of which are benign, suggests a link farm used to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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.cc/wix?keyword=centering+sheet+images
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/b8c837_b7f0dcd2498b4ed391d20b788fddc300.pdf
- https://static.usrfiles.com/ugd/4c1554_2f4e9502b99d4d8682dacc15f0351d55.pdf
- https://static.usrfiles.com/ugd/d54300_b9053be40b4d4c4c99a93a3115273759.pdf
- https://cdn.shopify.com/s/files/1/0429/7211/9193/files/10934374774.pdf
- https://cdn.shopify.com/s/files/1/0430/7851/6885/files/exhaust_fan_size_guide.pdf
- https://static.usrfiles.com/ugd/5be868_17bbda5587fa4a2583fb1039b3a94554.pdf
- https://static.usrfiles.com/ugd/ce14f3_7aa0611ab8db43df9db2135697e94451.pdf
- https://static.usrfiles.com/ugd/b8c837_de99a004d10848d0ae5c5c6978467e7e.pdf
- https://cdn.shopify.com/s/files/1/0437/0549/9803/files/54946655217.pdf
- https://cdn.shopify.com/s/files/1/0429/5449/0012/files/82198082732.pdf
- https://cdn.shopify.com/s/files/1/0430/6544/2455/files/52258024672.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_off000064d1.bin` `a18994b6436f079b3b82f9c318f5bcb39dcc25b9b4bef2b5415867f2d69d165f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x64D1	4972 bytes
`font_01_sfnt_off00007588.bin` `7b768f81c57612a90a4804316f0d199768b8b5fa6b5f559f58c161e389d50677`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7588	13616 bytes

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