PDF malware analysis — malicious · def1ef64a1677575

MALICIOUS

PDF

40.0 KB Created: 2020-09-07 05:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 2d36ea4491c8fea2414f48b8c0d14f9b SHA-1: 4867e489c72517a081a403faea5ffc3ba47dc570 SHA-256: def1ef64a1677575306e4bdd544a60fd2127cd0e7b990ca8493e1bd43fed5a70

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high number of external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to disguise the malicious intent. The ML classifier strongly indicates maliciousness, and the overall structure points to a link-based lure.

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.link/wix?keyword=assamese+new+bihu+video
- https://cdn.shopify.com/s/files/1/0434/1907/4722/files/isometric_dot_paper_0._5_cm.pdf
- https://cdn.shopify.com/s/files/1/0435/0479/5800/files/tivep.pdf
- https://cdn.shopify.com/s/files/1/0441/3220/4696/files/ziwitabofujogejetage.pdf
- https://cdn.shopify.com/s/files/1/0434/0439/4646/files/gegesugirawo.pdf
- https://cdn.shopify.com/s/files/1/0430/5318/7223/files/memavugojotejozodaliwifax.pdf
- https://cdn.shopify.com/s/files/1/0433/0268/2789/files/lolemofuje.pdf
- https://cdn.shopify.com/s/files/1/0430/3080/6679/files/teluduzuwiwovuzadesetore.pdf
- https://cdn.shopify.com/s/files/1/0429/5547/3059/files/fewuvawugi.pdf
- https://cdn.shopify.com/s/files/1/0434/2536/6165/files/apa_style_guide_to_electronic_references_sixth_edition.pdf
- https://static.usrfiles.com/ugd/8d57bd_892c2e66f2b44e429d863408dd0cb0be.pdf
- https://static.usrfiles.com/ugd/6cf0f5_c8dd15e7c7104d37805d371e5f2e8996.pdf
- https://static.usrfiles.com/ugd/b8c837_02dc9a9b57754c5db7d57ef4ae18daea.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_off00005ef9.bin` `fa25ca69df594b010d6dad8a34e121d55e833adb600cbdd8744b1a453fc24754`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5EF9	5220 bytes
`font_01_sfnt_off000070ab.bin` `18805eee17c4cbad35b5adfeeaf53ffe6cb848e80d1749e85acc14e4602da854`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x70AB	10196 bytes

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