PDF malware analysis — malicious · f2b5203fd1e1db80

MALICIOUS

PDF

49.2 KB Created: 2020-10-26 20:50:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31

MD5: 39a704e63f52ce6c580659b04b21a9ae SHA-1: 7ad4bb7fc4d7a30c3c14df5ce54070e78c601307 SHA-256: f2b5203fd1e1db80b0239c60cc7dce3916d990c140536bcc5e221b2a06c0d240

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to external PDF files, which is indicative of a link farm or SEO poisoning attempt. One of the primary links, 'https://cctraff.ru/strik?keyword=i7-4785t+vs+i5-4590t', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL, suggesting an attempt to disguise or obscure the malicious link.

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://cctraff.ru/strik?keyword=i7-4785t+vs+i5-4590t In PDF document text
- https://cdn-cms.f-static.net/uploads/4366374/normal_5f877d58650e7.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4367283/normal_5f8a44dcdb6e3.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4367273/normal_5f8c72514832f.pdfIn PDF document text
- https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/dubumevesuguzo.pdfIn PDF document text
- https://kufazijofiw.weebly.com/uploads/1/3/0/7/130776126/kumesitifekoledak.pdfIn PDF document text
- https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/6bf0e58d14.pdfIn PDF document text
- https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/37288358.pdfIn PDF document text
- https://moguvikob.weebly.com/uploads/1/3/0/8/130874292/6594843.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://uploads.strikinglycdn.com/files/02939774-452d-4853-8eab-1f08df348b27/57522402196.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/9e4feef3-2ab7-4343-9e94-8dac3cafaa32/8343132443.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/9a05e13b-2f9f-4548-a0d8-fcf919af2db0/simasam.pdfIn PDF document text
- https://s3.amazonaws.com/sezebepit/33909327391.pdfIn PDF document text
- https://s3.amazonaws.com/sugaguxagu/barn_burning_william_faulkner.pdfIn PDF document text
- https://s3.amazonaws.com/tadevewuju/swa_cable_gland_size_chart.pdfIn PDF document text
- https://s3.amazonaws.com/tigovatolis/elements_of_national_interest.pdfIn PDF document text
- https://s3.amazonaws.com/joterige/7323314388.pdfIn PDF document text
- https://s3.amazonaws.com/fujadabez/bujofuzebuveju.pdfIn PDF document text
- https://s3.amazonaws.com/vunizi/11031258070.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0504/2493/8694/files/70910705639.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0493/0250/3583/files/tovomi.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0428/9737/5388/files/perimeter_composite_shapes_worksheet.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0462/8463/6320/files/eastern_iowa_light_and_power_outage_map.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_off00007104.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7104	4608 bytes
SHA-256: `e04498430a31d310db6b97e2b667d887314d44a984748ea52a517d7bdb3c8bdd`
`font_01_sfnt_off000080bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x80BF	12004 bytes
SHA-256: `a656cf34e06162d2be56bbea3b8de89ce9ace00581ec217626ac7646ac5c6a9b`
`font_02_sfnt_off0000a993.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA993	4324 bytes
SHA-256: `4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3`

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