PDF malware analysis — malicious · 1c20cfcaad93c147

MALICIOUS

PDF

45.4 KB Created: 2020-10-27 11:53:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22

MD5: f8e9c80852b35f9fa130fc88778ef9be SHA-1: be51dbfb5083aa3544468980e17b009f6bb5ffe1 SHA-256: 1c20cfcaad93c1477281cdea9cc1ff7eb66b046e07f73a2697bb7e306322be58

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one pointing to a known malicious redirector, disguised as an XPS card printer installation guide. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to lead users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection scheme.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
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://cctraff.ru/strik?keyword=xps+card+printer+installation+and+user+guide In PDF document text
- https://cdn-cms.f-static.net/uploads/4369911/normal_5f8e1f2670b1b.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4393759/normal_5f92701080180.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4368971/normal_5f960cec43e2e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4380545/normal_5f8ec05942a7a.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4389616/normal_5f966151efa5f.pdfIn PDF document text
- https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/likanutavorolebonat.pdfIn PDF document text
- https://dosedupuwosiwoz.weebly.com/uploads/1/3/0/7/130776272/suliterapame.pdfIn PDF document text
- https://pixabetamomu.weebly.com/uploads/1/3/1/0/131070001/jumivum.pdfIn PDF document text
- https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/vowavebodujogoje.pdfIn PDF document text
- https://wonigebegi.weebly.com/uploads/1/3/1/6/131606731/turexir.pdfIn PDF document text
- https://kusanogiwaxug.weebly.com/uploads/1/3/0/8/130873987/6077352.pdfIn PDF document text
- https://sixonawujow.weebly.com/uploads/1/3/4/3/134369174/vexojujomeliw.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- https://cdn.shopify.com/s/files/1/0266/9661/4073/files/dd_5e_monster_manual_2.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0433/7680/3990/files/60648340839.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0504/7762/9639/files/72257321450.pdfIn PDF document text
- https://s3.amazonaws.com/henghuili-files/buwodizodizerijomo.pdfIn PDF document text
- https://s3.amazonaws.com/limewub/fejoburoxizi.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0500/6206/5828/files/19179851396.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0268/7326/6352/files/bamu_phd_progress_report.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0501/7147/8168/files/cystic_fibrosis_sweat_test_guidelines.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00006567.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6567	5100 bytes
SHA-256: `3a971e106c7e5b588e3e5c8f03bbce1c201c968fa8426fec78af2d90316869fe`
`font_01_sfnt_off000076c1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x76C1	10276 bytes
SHA-256: `814a0f45feee406bed15b3df9a52be255ca691e1647b72dfc6cf1d312bab60cf`
`font_02_sfnt_off000099b7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x99B7	4324 bytes
SHA-256: `d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378`

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