PDF malware analysis — malicious · ab734a4ac0e860dd

MALICIOUS

PDF

43.9 KB Created: 2020-10-28 11:23:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14

MD5: a119c6d06f1f42694e86b537f58b0180 SHA-1: 3c4324ce90c810094ce627a53018f99b4e6539a6 SHA-256: ab734a4ac0e860dd404555c8ea7bc7f8c6d92a98605828bdfbf127cb8c35cd74

244 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF document is identified as malicious due to its function as a link farm and a credential phishing lure impersonating USPS. It contains numerous links, including a primary redirector URL, designed to lead users to potentially malicious content. The ML classifier strongly indicated maliciousness, and the presence of a brand impersonation heuristic further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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.
Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH

Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://sepenunaxob.weebly.com/uploads/1/3/0/7/130776074/5055426.pdf.
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://ttraff.link/123?keyword=price+floor+and+ceiling+worksheet+answers In PDF document text
- https://sepenunaxob.weebly.com/uploads/1/3/0/7/130776074/5055426.pdfIn PDF document text
- https://mojenosude.weebly.com/uploads/1/3/1/3/131382274/3355390.pdfIn PDF document text
- https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/xopowinubomokon-zozofefodijawuf-bimafajawevagu-pilavebenixe.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4379971/normal_5f8e03397b570.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366402/normal_5f871e1ca89c3.pdfIn PDF document text
- https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/noterufuwuxavo.pdfIn PDF document text
- https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/wewisudate_xugej_garowulexaganu_piwuzu.pdfIn PDF document text
- https://latenenagizogip.weebly.com/uploads/1/3/2/6/132696064/616a32b3f9aa22.pdfIn PDF document text
- https://rilebowiteb.weebly.com/uploads/1/3/3/9/133986594/kefewibu.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/1/0497/8016/2721/files/wadikuwakekepo.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0432/6896/4520/files/chemistry_2_for_dummies.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0495/9253/3155/files/ruger_blackhawk_elite_manual.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/12099f36-24cc-489c-82ad-90fad1335c49/13545925928.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/12296ac3-eb34-41b3-81a6-5fa763190d12/sadufokusoteruf.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_off00005e42.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5E42	5228 bytes
SHA-256: `57d3577a5b3b8fe419bc6ed196c48e7c4094d7134b586ecbad818fcddcdf52c5`
`font_01_sfnt_off00007004.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7004	11388 bytes
SHA-256: `2b37b0379fcad1a45ee08523587d6b7046063c3f5b4ba4c988e70bd7411f554f`
`font_02_sfnt_off00009467.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9467	4324 bytes
SHA-256: `4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3`

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